Custom Software Engineering
Bespoke applications and platforms built to your exact workflows — from product to delivery.
Bespoke software, secure infrastructure, and data systems — engineered precisely to the shape of your problem.
A university-level reference, sister to the school above: every assumption declared before it's used, every step justified, every result told where it stops being true. ~410 physics derivations plus full maths, chemistry and biology curricula — free, no sign-up.
Explore physics2u →Everyday calculators and developer utilities. No sign-up, no downloads, nothing leaves your device — every tool runs entirely in the browser.
Monthly repayment + full amortization schedule.
Savings growth — simple vs compound, with deposits.
Percent of, % change, tip, discount & tax.
Live exchange rates across 30+ currencies.
Temperature, data, length, power & more.
Words, characters, reading time & keywords.
Body-mass index + your healthy weight range.
Monthly PITI, interest & amortization.
Car payment with tax, trade-in & APR.
Full payment table + CSV export.
Compare loans & find your break-even.
Snowball vs avalanche, side by side.
Interest, principal, rate or time.
True APR from rate + fees.
How much can you borrow (DTI)?
Pay off sooner & save interest.
Maturity value & APY.
Solve PV, FV or payment.
Compare the true cost over time.
Front & back-end DTI ratios.
Target fund & time to reach it.
Build & print a professional invoice — tax, totals, PDF.
Profit, gross margin & markup — solved any way round.
Units & revenue to break even — with a live chart.
Add, remove or isolate tax at any rate — VAT, GST.
Weekly hours, breaks, overtime & gross pay.
What a meeting really costs — with a live ticker.
Make a QR for any link or text — PNG & SVG, fully offline.
Format, validate & minify JSON.
Encode & decode Base64 text.
MD5, SHA-1, SHA-256 & more.
Test & debug regular expressions live.
Unix time ⇄ human-readable date.
Random v4 UUIDs, single or in bulk.
Decode header, payload & claims — in-browser.
Encode & decode URLs and components.
Encode & decode HTML entities safely.
Shrink CSS — strip comments & whitespace.
Strip comments & whitespace from JS.
Compress HTML, keep pre/script intact.
Turn JSON arrays into spreadsheet CSV.
Parse CSV into clean JSON objects.
Convert between JSON and YAML both ways.
Beautify & minify SQL queries.
Explain cron & see the next run times.
Binary, octal, decimal, hex & any base.
Pretty-print & validate XML with indentation.
Convert XML markup to clean JSON.
Turn JSON objects into XML markup.
Reformat & indent messy HTML cleanly.
Format CSS — indent, space & tidy rules.
Reformat & indent minified JavaScript.
Convert HTML into clean Markdown.
Build a .gitignore for any stack & tool.
Redirects, rewrites & security rules.
Encode & decode Base32 text (RFC 4648).
Keyed HMAC — SHA-1/256/384/512.
Hash & verify passwords with bcrypt.
Generate TS interfaces from any JSON.
Searchable reference for every status code.
Geolocation & network info for any IP.
Query A, MX, TXT & more records.
Inspect a site's TLS certificate.
Check common open ports on a host.
CIDR, masks & usable IP ranges.
Strong, random, configurable passwords.
UPPER, lower, Title, camelCase, snake_case & more.
Placeholder text — paragraphs, sentences, lists.
Compare two texts line by line — added & removed.
Bulk replace with case, whole-word & regex modes.
Strip duplicate lines, keep order or sort.
Alphabetical, numeric, length, reverse or shuffle.
Turn any title into a clean URL slug.
Live Markdown → HTML, side by side.
Trim, collapse spaces, strip blank lines.
Flip text, words or lines back to front.
Repeat any text N times, spaced or joined.
Test if text reads the same both ways.
Translate text ⇄ Morse, with audio playback.
Convert text to binary and back again.
Shift-encrypt text by any rotation.
Classic ROT13 encode / decode in one click.
Spell words as Alfa-Bravo-Charlie.
Translate English into playful Pig Latin.
Unicode fonts & styles for bios & posts.
Trig, logs, powers, memory — full keypad.
Add, subtract, multiply & simplify fractions.
Solve, simplify & scale ratios.
Mean, median, mode, std-dev & quartiles.
Greatest common divisor & lowest multiple.
Test primality & factorize any number.
Roots, discriminant & vertex, with steps.
Unbiased random numbers in any range.
Convert numbers ⇄ Roman numerals.
Spell out numbers & money in words.
Tip, total & split the bill any way.
Sale price, savings & stacked discounts.
Return on investment & annualized ROI.
Hourly ⇄ annual and everything between.
Time or monthly amount to hit a goal.
Project your nest-egg to retirement.
Purchasing power over time.
Months to clear a balance & interest.
Assets minus liabilities, live.
Split income into needs, wants & savings.
BMR, maintenance & weight-goal calories.
US Navy method — fat & lean mass.
Four formulas + healthy BMI range.
Daily hydration target for your body.
Protein / carb / fat grams from calories.
Pregnancy due date & milestones.
Fertile window & cycle predictions.
Max HR & five training zones.
Pace, time or distance — solve any.
Best bedtimes & wake times by cycle.
Exact age, next birthday & day born.
Days, weeks & business days between dates.
Add or count working days, skip holidays.
Live countdown to any date & time.
Add or subtract days, weeks, months, years.
Add, subtract & sum durations.
Convert times across world zones (DST-aware).
ISO week, day-of-year & quarter.
Focus / break cycles with a beep.
Laps & countdown, drift-free.
°C, °F, K & Rankine, live-linked.
kg, g, lb, oz, stone, tonne & more.
km/h, mph, m/s, knots & Mach.
m², ft², acres, hectares & more.
Litres, gallons, cups, pints & more.
Cups ⇄ grams ⇄ ml, ingredient-aware.
MPG ⇄ L/100km ⇄ km/L.
Pa, bar, psi, atm, mmHg & more.
Joule, calorie, kWh, BTU & more.
US, UK, EU & cm — men, women, kids.
HEX, RGB, HSL, HSV + tints & shades.
Convert color formats both ways.
Harmony palettes from any base color.
Linear & radial CSS gradients.
WCAG AA/AAA contrast ratios.
Design CSS box-shadows visually.
Round corners & blob shapes, live.
See colors as CVD users do.
Nearest CSS color name ⇄ hex.
Resize by pixels or % in your browser.
Shrink JPEG/WebP file size, keep quality.
Data-URI + HTML/CSS snippets.
PNG ⇄ JPEG ⇄ WebP.
Crop with a draggable selection.
All favicon sizes + HTML tags.
Pull a palette from any image.
Title, description, robots & more.
Social share cards + live preview.
Crawl rules & sitemap directives.
Tag campaign URLs for analytics.
Phrase frequency & density %.
Preview your Google search snippet.
Pick a random winner from a list.
Roll d4–d100 with modifiers.
Heads or tails, with stats.
Fresh handle ideas, any style.
Secure keys, tokens & strings.
Rate strength, entropy & crack time.
Bits, bytes, KB, MB, GB, TB, KiB, MiB, GiB.
bps, kbps, Mbps, Gbps, MB/s, GB/s.
Degrees, radians, gradians, arcmin, turns.
Newton, kN, dyne, lbf, kgf, ozf.
Watt, kW, MW, hp, BTU/h.
kg/m³, g/cm³, lb/ft³, kg/L.
Hz, kHz, MHz, GHz, RPM.
N·m, lbf·ft, lbf·in, kgf·m.
m³/s, L/s, L/min, m³/h, GPM.
m/s², g-force, ft/s², gal.
Lux, foot-candle, phot, kilolux.
m/s, km/h, mph, knots, ft/s.
Grow a lump sum with compound interest.
Today’s worth of a future amount.
Compound annual growth rate of an investment.
Years to double your money at any rate.
Future value of steady monthly investing.
Profit, return % and break-even on a trade.
Yield % and annual income from dividends.
Project retirement savings with employer match.
Down payment + loan amount on a home.
Net pay after taxes & deductions.
Weekly pay with overtime hours.
Commission + base on your sales.
Tax & net proceeds on a gain.
Savings rate + rough years to FI.
Inflation-adjusted investment return.
Max car price from a monthly budget.
Home price you can afford (28/36 rule).
Split pay into needs / wants / savings.
Rate to charge to hit your income goal.
% increase/decrease between two numbers.
Hypotenuse, area & angles of a right triangle.
Area, circumference & diameter from radius.
Slope, angle & equation from two points.
Euclidean distance & midpoint of 2 points.
Compute n! for any whole number.
nPr and nCr for choosing r from n.
Raise a base to any power (bⁿ).
log in any base, plus ln and log₁₀.
Standard score from mean & std deviation.
Mean, median, mode & range of a list.
Round, floor, ceil & truncate a number.
Remainder & quotient of a ÷ n.
Convert numbers to a × 10ⁿ form.
Convert a fraction to decimal & %.
Convert a decimal to a reduced fraction.
Sample & population SD, variance, mean.
Area from base/height or 3 sides.
Volume & surface area of a cylinder.
Volume & surface area of a sphere.
Volume & surface area of a cone.
Solve a/b = c/x for x.
Prime factors of any integer.
Percent error vs a true value.
Total daily calories burned + cut/bulk.
Calories burned at rest (Mifflin-St Jeor).
Estimate max lift from weight × reps.
Lean vs fat mass from body-fat %.
WHtR health-risk indicator.
What cigarettes cost over time.
Calories burned by activity & time.
Daily protein target by activity.
WHR + health-risk category.
Estimate BAC (Widmark). Educational.
Steps → distance & calories.
BSA (Mosteller & Du Bois).
Capitalize each major word in a title.
Capitalize the first letter of each sentence.
𝗕𝗼𝗹𝗱 Unicode text for bios & posts.
Flip text to uʍop ǝpısdn.
Convert text to sᴍᴀʟʟ ᴄᴀᴘs.
Flatten text into a single block.
Flesch reading ease & grade level.
Reverse the order of words in text.
aLtErNaTiNg mocking-case text.
ｆｕｌｌｗｉｄｔｈ aesthetic text.
C̶r̶o̶s̶s̶e̶d̶ ̶o̶u̶t̶ Unicode text.
ˢᵘᵖᵉʳˢᶜʳᶦᵖᵗ Unicode text.
#Turn keywords into hashtags.
Rank the most-used words in text.
Keep only the first of each word.
C̷r̴e̵e̶p̷y̸ glitch text generator.
Put 👏 claps 👏 between 👏 words.
U̲n̲d̲e̲r̲l̲i̲n̲e̲d̲ Unicode text.
Ⓒⓘⓡⓒⓛⓔⓓ Unicode letters & numbers.
Countdown of days to any future date.
Elapsed days since any past date.
Is a year a leap year? + next one.
What weekday is any date?
Weeks & days between two dates.
Months & years between two dates.
Days to your next birthday + age.
Convert RGB colour to CMYK for print.
Convert hex colour to HSL & RGB.
Keep proportions when resizing.
Screen pixels-per-inch & dot pitch.
Unix permissions → octal & symbolic.
How long a file takes to download.
Fluid responsive clamp() values.
Entropy bits & crack-time estimate.
AND, OR, XOR, NOT & shifts.
Appliance running cost per day/month/year.
How much paint a room needs.
Tiles needed for a floor or wall.
Fuel cost of any journey.
Which package is the better deal?
Concrete volume & bags for a slab.
Split a bill + tip between people.
Approximate yield to maturity of a bond.
Annual coupon divided by market price.
Periodic bond coupon from rate and face value.
Discounted present value of a bond.
Price-to-earnings ratio from price and EPS.
Earnings per share from net income and shares.
P/E ratio divided by earnings growth rate.
Share price divided by book value per share.
Share price divided by sales per share.
EPS divided by price, the inverse P/E.
Dividends per share as a share of EPS.
Gordon model stock valuation from dividends.
Dividend reinvestment growth over time.
Fee drag on investment growth over time.
Total load and expense-ratio fees over time.
Inflation-adjusted future value of money.
Nest egg needed to retire early.
Invest now, coast to your FIRE goal.
Withdrawal rate vs the 4% rule.
Sustainable income a nest egg provides.
Periodic payment from an immediate annuity.
Present value of an endless cash stream.
Net present value of equal cash flows.
Internal rate of return of equal cash flows.
Time to recoup an investment’s cost.
PV of inflows per dollar invested.
Risk-adjusted return above the risk-free rate.
Expected return from beta and market premium.
Weighted average cost of capital.
Weighted average return of a portfolio.
Stock/bond split from your age.
EAR from a nominal rate and compounding.
Annual percentage yield from APR.
NOI divided by property price.
Gross and net yield of a rental property.
Annual cash flow over cash invested.
Add or remove VAT at any rate.
Add or remove GST at any rate.
Add a service charge and split a bill.
Convert gross price to net price.
Cost plus markup to selling price.
Profit, margin % and markup % from cost.
Gross profit and margin from COGS.
Price to hit a target margin.
Sale price after a % discount.
Stack two discounts on one price.
Margin per unit and CM ratio.
Units to sell to cover fixed costs.
Return on ad spend ratio and %.
Cost per 1,000 impressions.
Cost per click from spend and clicks.
Customer acquisition cost.
Lifetime value vs acquisition cost.
LTV ratio and equity from loan & value.
Debt service coverage ratio.
Assets minus current liabilities.
Assets over current liabilities.
Acid-test liquidity ratio.
Subtotal, discount, tax and shipping.
Interest and fee on overdue invoices.
1.5x overtime rate and pay.
Annual income to a daily rate.
Net pay from gross, tax and deductions.
Cross rate from two given rates.
Price per square foot and metre.
Affordable rent from your income.
Deposit and move-in cost from rent.
Meals and lodging over trip days.
Miles times your per-mile rate.
Even annual depreciation of an asset.
Accelerated depreciation year one.
EBITDA as a percent of revenue.
Monthly lease from cap cost and money factor.
Compare leasing against buying and reselling.
Cost to charge from battery size and price.
Annual electric vs gasoline fuel cost.
Future value from an annual loss rate.
Depreciation, fuel, insurance and upkeep.
Loan interest vs investing the cash.
Trade-in value minus loan payoff.
Total tolls for a one-way or round trip.
Yearly savings from a better MPG.
Fuel wasted idling per year.
Annual oil change cost and cost per mile.
Fuel stops and cost for a long drive.
Revenue minus costs, interest and taxes.
Beginning balance plus profit minus dividends.
COGS divided by average inventory.
Average days to collect receivables.
Average days inventory is held.
DIO plus DSO minus DPO.
Beginning inventory plus purchases minus ending.
Operating income divided by revenue.
Revenue minus COGS and operating expenses.
Monthly net cash spend of a startup.
Months of cash left at current burn.
ARPU times gross margin over churn.
Customers lost divided by customers at start.
Customers times average monthly revenue.
Monthly recurring revenue times twelve.
Total revenue divided by active users.
Revenue kept from existing customers.
New ARR per dollar of sales spend.
Growth rate plus profit margin vs 40%.
Liquid assets over current liabilities.
Average days to pay suppliers.
Units times price, less returns and discounts.
Net income divided by revenue.
Net income divided by total assets.
Net income divided by shareholder equity.
Revenue divided by average total assets.
EBIT divided by interest expense.
Optimal order quantity to minimize cost.
Buffer stock against demand variability.
Lead-time demand plus safety stock.
Sales minus variable costs over sales.
Demand response to a price change.
Marketing spend divided by conversions.
Months to recover customer acquisition cost.
Lifetime value divided by acquisition cost.
Revenue kept before expansion, over start.
Profit or loss from a crypto trade.
Total invested across recurring crypto buys.
Weighted average price of two crypto buys.
Return on investment for a crypto holding.
Gain, tax and after-tax profit on a sale.
Compounded crypto growth over years.
Daily mining profit from hash rate and power.
Days to pay off mining hardware.
Network share and expected coins per day.
Rewards earned from staking crypto.
Extra tokens from staking versus holding.
Convert APR to APY with compounding.
Rewards from a liquidity pool over time.
Loss versus holding from LP price divergence.
Ethereum gas fee in ETH and USD.
Convert wei, gwei and ether units.
Convert satoshis, bits, mBTC and BTC.
Market cap and FDV from price and supply.
Implied price from a target market cap.
Liquidation price for leveraged trades.
Margin-call price from equity and margin.
Perpetual futures funding paid over time.
Royalty, fee and net on an NFT sale.
Net value of a crypto airdrop.
Percentage weights across crypto assets.
Buy/sell amount to hit a target allocation.
Value of a pip for a forex position.
Units to trade for a fixed risk amount.
Risk/reward and break-even win rate.
Stop-loss price and loss at the stop.
Take-profit price and profit at target.
Sell price to break even after fees.
Total fees from repeated round-trip trades.
LTV and liquidation buffer on a crypto loan.
Block reward and supply after halvings.
Vested and locked tokens over a schedule.
Debt, Income, Mortgage and Education total.
Income multiple plus expenses less assets.
Present value of future net earnings.
Base rate times risk factor less discounts.
Coverage times rate per $1,000 less discounts.
Premiums plus your capped medical share.
Which plan costs less at your claim level.
Bills needed to hit your OOP maximum.
Contribution growth and yearly tax savings.
Tax-free HSA vs taxable account value.
Tax saved on pre-tax FSA contributions.
Yearly copays for visits and prescriptions.
Your share after deductible and coinsurance.
Monthly benefit gap versus your expenses.
Assets and income at risk beyond your limits.
Square footage times build cost per sq ft.
Replacement cost less age depreciation.
Earned premium and refund for partial terms.
Net premium after a no-claim bonus.
Level payout from principal over N years.
Present value of payments versus a lump sum.
Adjust a benefit for early or late claiming.
Full premium plus the admin fee.
Payroll times rate times experience mod.
Cover net worth plus an income buffer.
Loan balance minus vehicle actual cash value.
Reimbursed vet costs versus the premium.
Sum of belongings plus a safety buffer.
Lifetime premiums and the invested difference.
Monthly savings to reach a reserve target.
Claim-free years to cover a higher deductible.
Future coverage needed after inflation.
Projected cash value from premiums and rate.
Payoff balance plus a payment buffer.
Present value of income with growth.
Out-of-pocket max per person plus a buffer.
CTR from clicks and impressions.
CPL from spend and leads generated.
Cost per 1,000 ad impressions.
Engagement rate by follower count.
Growth rate from start to end count.
Average frequency from reach & impressions.
Open rate from opens and deliveries.
CTR and click-to-open rate for email.
Bounce rate from bounces and sessions.
AOV from revenue and order count.
Abandonment from carts vs purchases.
ROAS from revenue and ad spend.
Split ad budget across channels.
Stage rates from visitors to customers.
Close rate from leads to customers.
ROI from marketing revenue and cost.
Estimated revenue from views and RPM.
CPM and cost per engagement of a post.
NPS from promoters and detractors.
K-factor from invites and conversion.
Brand share of total market activity.
CPV from spend and video views.
CPE from spend and engagements.
CAC from total spend and new customers.
Total value and ROI of conversions.
Required ROAS for a revenue goal.
Minimum ROAS from profit margin.
Months to recoup acquisition cost.
Net list growth from subs and unsubs.
Attendance and buyer conversion rates.
Conversion rate from visitors.
Posts per day, week and month.
Total cost of baby’s first year.
Daily, monthly and yearly diaper spend.
Daily, monthly and yearly formula cost.
Project a college fund’s future value.
Total cost to raise a child to 18.
Kids’ allowance by age of child.
Plan the cost of a baby shower.
Total pay during maternity leave.
Yearly and monthly daycare costs.
Cost of a babysitter for the night.
First-year cost of raising twins.
Rough support as a share of income.
Assign every dollar until you reach zero.
Split income into cash spending envelopes.
Split a paycheck into needs, wants, savings.
Smallest balance first payoff plan.
Highest APR first payoff plan.
True cost of paying only the minimum.
Balance-to-limit ratio and score impact.
Is your rent within the 30% rule?
Weekly and monthly food budget by household.
Yearly and 5-year cost of subscriptions.
When a subscription beats pay-per-use.
How saved allowance grows over the years.
Monthly amount to reach a dated goal.
New salary and increase from a raise.
Does your raise keep up with inflation?
Quick net pay from gross salary.
Portfolio for a frugal early retirement.
Portfolio for a high-spending early retirement.
Portfolio when part-time income helps.
Years to FI from your savings rate.
Invested value of a monthly spending cut.
Future value of a small daily spend.
Savings from a no-spend streak.
Cash back earned from card spending.
Dollar value of loyalty points.
Savings from paying annually vs monthly.
Net cost divided by number of uses.
Clothing cost divided by times worn.
Membership fee divided by visits.
Savings from brewing coffee at home.
Money saved by giving up cigarettes.
Weeks of side work to hit a goal.
Hours worked to cover monthly expenses.
Passive income as a share of expenses.
Years of expenses your net worth covers.
Savings benchmarks by age vs income.
Down payment, closing fees, cash to close.
Time to save your home down payment.
Private mortgage insurance monthly cost.
Annual and monthly property tax estimate.
Long-term cost of monthly HOA dues.
Interest saved with extra monthly payments.
Savings from biweekly mortgage payments.
Interest-only and amortized HELOC payments.
Equity, LTV, and borrowable amount.
Cost and break-even of buying rate points.
Projected rent after annual increases.
Rental net operating income from income and expenses.
Buy vs rent price-to-rent ratio.
Profit and ROI on a fix-and-flip.
Renovation budget with contingency buffer.
Annual income lost to vacant days.
Monthly cash flow after all expenses.
Cash netted after selling a home.
Prorated rent for a partial month.
New payment after a lump-sum recast.
Principal, interest, taxes, insurance payment.
NOI divided by loan amount.
Annual mortgage constant from rate and term.
Price divided by annual gross rent.
Rent vs 1% of purchase price.
Estimated expenses and cash flow at 50%.
Occupancy needed to cover costs and debt.
Future home value from annual appreciation.
Months of housing costs to keep in reserve.
Land vs building value split.
Rent as a share of gross income.
Prepay mortgage vs invest the difference.
Prorate property taxes at closing.
Months to recoup refinance closing costs.
IO payment vs payment after the IO period.
Monthly escrow for taxes and insurance.
Flights, hotel, food and extras totalled.
Miles and points worth in cash.
Checked-bag fees across passengers and legs.
Daily budget and rate to foreign cash.
Local-currency tip and bill split.
Monthly saving to hit a trip goal.
Nightly rate, nights, rooms and tax.
Daily rate, insurance and fees totalled.
Driving fuel cost versus airfare.
Flight CO2 and cost to offset.
Miles and trips to the next status tier.
Trip cost and rate to premium estimate.
Greatest common divisor of two integers.
Least common multiple of two integers.
Cube root of any number, negatives too.
Any-index real root of a number.
ln(x) plus log base 10 and 2.
Magnitude of any positive or negative number.
Multiplicative inverse 1/n of a number.
Solve a/b = c/d for the unknown term.
Round a number to n significant figures.
Mixed number to improper fraction converter.
Improper fraction to mixed number converter.
Reduce a fraction to lowest terms.
Nth term and sum of an arithmetic series.
Nth term and sum of a geometric series.
Nth Fibonacci number and the sequence.
Nth triangular number, n(n+1)/2.
Sum of all whole numbers 1 through n.
Trailing zeros of n! via powers of 5.
Is a number a perfect square?
Does a number equal its divisor sum?
Steps to reach 1 in the 3n+1 problem.
Sum of digits and digital root.
Count and list all divisors of a number.
GCD of a comma-separated list of integers.
LCM of a comma-separated list of integers.
Square root of any number, negatives too.
Is a divisible by b? Quotient and remainder.
Are two integers relatively prime?
The prime number at position n.
All primes up to a chosen limit.
Sigma and aliquot sum of a number.
All factor pairs that multiply to n.
Compute (a^b) mod m by fast squaring.
Multiplicative inverse of a modulo m.
b² − 4ac and the nature of the roots.
Sum of squares 1² through n².
Area of a circle from radius.
Perimeter of a circle from radius.
Area, height and perimeter from side.
Hypotenuse, area and angles from legs.
Longest side of a right triangle.
Area, perimeter and diagonal.
Area, perimeter and diagonal from side.
Area from parallel sides and height.
Area from base and height.
Area from the two diagonals.
Area of a regular n-gon.
Area from the two semi-axes.
Surface area from radius.
Volume, surface area and diagonal.
Volume and surface area of a cuboid.
Volume from base area and height.
Volume and surface area of a donut.
Area and arc length of a sector.
Arc length from radius and angle.
Chord from radius and central angle.
Midpoint between two (x, y) points.
y = mx + b from two points.
Third side from two sides and angle.
Unknown side from a side and two angles.
Convert angles degrees to radians.
Circle radius from a known area.
Averages of a data set.
Sample or population variance.
Value at the nth percentile.
Min, max and range of a data set.
Std deviation relative to the mean.
Nth root of the product of values.
Reciprocal average of values.
Weighted mean of values and weights.
Q1, Q2, Q3 and interquartile range.
Interval for a mean with margin of error.
Your weight across the solar system.
Your age in every planet year.
Convert weight between any two worlds.
Kepler's third law period from orbit size.
How long light takes to arrive.
Light-years to km, miles, AU, parsecs.
Parsecs to light-years, AU and km.
Magnification from focal lengths.
Telescope f-ratio from focal length.
True field of view through the eyepiece.
Apparent size from object size and distance.
Observed brightness from distance modulus.
Intrinsic brightness from apparent magnitude.
Recession velocity from redshift z.
Tsiolkovsky delta-v from mass ratio.
Planet gravity from mass and radius.
Alignment period of two orbits.
Calendar date to Julian Date.
GMST and local sidereal time.
Star sign from a birth date.
AU to km, miles and light units.
Black hole event horizon radius.
Tidal stretching near a massive body.
Goldilocks zone from star luminosity.
Transfer delta-v and travel time.
Clock slowdown near a mass.
Luminosity from radius and temperature.
Hawking temperature from mass.
Eccentricity from periapsis and apoapsis.
Mean density from mass and radius.
Tidal breakup distance for a satellite.
Starlight dip from a transiting planet.
Your weight on the lunar surface.
Sunlight intensity by distance from the Sun.
Civilisation type from power output.
Galaxy distance from redshift via Hubble law.
Estimate acceleration from horsepower and weight.
HP = torque x RPM / 5252.
Torque = HP x 5252 / RPM.
Litres, cc and ci from bore and stroke.
(swept + clearance) / clearance volume.
ET and trap speed from hp and weight.
True speed after a tire size change.
Range from battery size and mi/kWh.
Estimate hp from displacement in cc.
AFR and lambda from air and fuel mass.
Speed from tire diameter and wheel RPM.
Speed from RPM, gearing and tire size.
Ring gear teeth / pinion gear teeth.
cc/min and lb/hr from hp and BSFC.
Boosted hp from NA power and psi.
Backspacing from wheel width and offset.
Stopping distance from speed and grip.
Hydroplaning speed from tire pressure.
EV mi/kWh into MPGe equivalent.
km/L, L/100km and MPG from a fill-up.
Antifreeze and water for a target ratio.
CCA and cold cranking from amp-hours.
Load current vs alternator amps.
Molar concentration from moles and litres.
Moles of solute per kg of solvent.
Grams per mole from mass and moles.
C1V1 = C2V2 dilution solver.
Actual over theoretical yield, as a percent.
Convert moles into a mass in grams.
Convert a mass in grams into moles.
Moles into particle count via Avogadro.
PV = nRT solved for moles.
P1V1 = P2V2 at constant temperature.
V1/T1 = V2/T2 at constant pressure.
P1/T1 = P2/T2 at constant volume.
P1V1/T1 = P2V2/T2 solved for V2.
pH = -log10[H+] with pOH too.
pOH = -log10[OH-] with pH too.
pKa = -log10(Ka) acid strength.
Buffer pH from pKa and A-/HA ratio.
Mass of element over total compound mass.
Simplest mole ratio of two elements.
Parts per million from mass ratio.
Solute mass over solution mass, percent.
Solute volume over solution volume, percent.
Normality from molarity and valence.
Molar mass divided by the n-factor.
Unknown concentration via M1V1 = M2V2.
Remaining amount after decay over time.
ΔG = ΔH - TΔS spontaneity check.
ΔH from products minus reactants.
Gas volume from V = nRT/P.
ΔTf = i·Kf·molality.
ΔTb = i·Kb·molality.
Π = iMRT in atmospheres.
Change in concentration over time.
Desired product mass over reactant mass.
Max product mass from limiting reagent.
Particles into moles via Avogadro.
Honors and AP bonus points on your GPA.
Combine prior and current term GPAs.
Letter grades and credits to a 4.0 GPA.
Percentage grade to a 4.0 GPA point.
A+ to F converted to 4.0 GPA points.
Rank and class size to a percentile.
Credits required to hit a target GPA.
Weekly study hours from your credit load.
Days and study hours until your exam.
Words read and time to words per minute.
Characters, time and errors to typing WPM.
Word count to estimated page count.
Page count to estimated word count.
Word target and words left for an essay.
Classes attended versus total as a percentage.
Homework, quiz and exam weights to a grade.
Scale a raw score using a grading curve.
Final score needed to reach a passing grade.
Points earned out of total to a percentage.
Percentage score to a letter grade.
Check your GPA against honor roll tiers.
Check GPA and credits for Dean's List.
Best section scores across SAT attempts.
Four ACT sections to a composite score.
Average a list of numeric grades.
Current grade and final score to a course grade.
Sum rubric criteria into a percentage.
Raw score to a scaled score range.
Percentile to a score via mean and SD.
Focus and break cycles for a study session.
Students retained versus started as a rate.
Average quiz scores, drop lowest optional.
Speed from distance and time.
Displacement over elapsed time.
Force from mass and acceleration.
Energy of a moving mass.
Stored energy at a height.
Force applied over a distance.
Work performed per unit time.
Range, height and flight time.
Distance and speed while falling.
Max falling speed with air drag.
Force from friction coefficient.
Spring force from stretch.
Swing time from length.
Inward force in circular motion.
Inward acceleration in a circle.
Rotational inertia of shapes.
Attraction between two masses.
Speed to escape gravity.
Speed for a circular orbit.
Upthrust on a submerged object.
Velocities after elastic impact.
Combined velocity after impact.
Impulse from force and time.
Surface speed from rotation.
Ratio from gear tooth counts.
Load force over effort force.
Output over input energy.
Acceleration from net force.
Weight from mass and gravity.
Distance under acceleration.
From velocity change and time.
Rope tension on a mass.
Support force on a surface.
Ramp forces and acceleration.
Effort from rope segments.
Torque from force and lever arm.
Speed from frequency and wavelength (v=fλ).
Period and angular frequency from frequency.
Observed frequency shift for moving sources.
Angle of refraction from indices of refraction.
Image distance and magnification (1/f=1/do+1/di).
Magnification and image height (m=-di/do).
Focal length, image distance and magnification.
Energy in joules and eV (E=hc/λ).
Sound level in dB from intensity (W/m²).
Level drop with distance (inverse-square).
Index of refraction from light speed (n=c/v).
Diffraction angle from lines/mm and order.
Harmonic frequency and wavelength (fn=nv/2L).
Fundamental pitch from tension and density.
Beats from two tone frequencies (|f1−f2|).
Sum two dB levels logarithmically.
Length change from heating (ΔL=αL₀ΔT).
Volume change from heating (ΔV=βV₀ΔT).
Energy to change temperature (Q=mcΔT).
Energy to melt a mass (Q=mL).
Conduction rate through a slab (Fourier).
Radiated power from temperature (P=εσAT⁴).
Max engine efficiency (η=1−Tc/Th).
Feels-like temperature (NWS formula).
Feels-like temperature from heat and humidity.
Dew point from temperature and humidity.
Humidity from temperature and dew point.
Wet-bulb temp from heat and humidity (Stull).
Insulation R-value and U-value (R=d/k).
Conductive resistance in K/W (R=L/kA).
Peak wavelength from temperature (Wien).
Specific heat from Q, mass and ΔT.
Ideal COP for cooling and heating (Carnot).
Pressure altitude from altimeter setting.
Sound speed in dry air by temperature.
Total internal reflection angle (θc=asin n₂/n₁).
American to decimal, fractional, implied.
Moneyline odds to decimal odds.
Decimal odds to fractional and more.
Break-even probability from odds.
Combined odds and payout of a parlay.
Optimal bet size from odds and edge.
EV of a wager from odds and edge.
Z statistic and two-tailed p-value.
Pooled t statistic, df and p-value.
Goodness-of-fit chi-square and p-value.
Z-score to left, right or two-tailed p.
Pearson r between two data sets.
Least-squares slope, intercept and R².
R² and variance explained from r.
Standard error of the mean, s/√n.
Two-proportion z-test for A vs B.
Absolute and relative lift between rates.
P(X=k) and cumulative Poisson values.
Exact and cumulative binomial probabilities.
Area under a normal curve between bounds.
Percentile rank of a score in data.
IQR method with 1.5×IQR fences.
Sample and population covariance of X,Y.
Effect size from two group summaries.
Odds ratio and 95% CI from a 2×2 table.
Risk ratio and 95% CI between groups.
Sensitivity, specificity, PPV, NPV, accuracy.
Mean and variance of a discrete distribution.
Min, Q1, median, Q3 and max.
R² from paired X and Y data.
Survey size for a target margin of error.
Sample size to estimate a mean.
Cohen's d and Hedges' g from two samples.
Z-score and percentile of a value.
Average of the min and max values.
Robust mean after trimming both tails.
Average absolute distance from the mean.
Quadratic mean of a data set.
Multiplicative spread of positive data.
Interval for one future observation.
Normal two-sided tolerance interval.
Mean over standard deviation, plus dB.
Chance an event occurs in n trials.
Cups, tbsp, tsp, mL, fl oz, pints.
Grams, oz, lb, cups of flour or sugar.
Sticks, tbsp, cups, grams and ounces.
ppm, gpg, dH, fH, mmol/L, mEq/L.
px, pt, pica, em, rem, inch, mm.
DPI, PPI, dpcm, dpmm, dppx.
Cups of any ingredient to grams.
Celsius, Fahrenheit and gas mark.
Celsius, Fahrenheit, Kelvin, Rankine.
Coffee-to-water ratio for any brew.
Pixels and DPI to inches and cm.
Pixel dimensions to megapixels and ratio.
A-series, B-series, Letter, Legal dimensions.
Circumference to US and EU ring size.
Head circumference to hat size.
US, UK and EU dress sizes.
Hand circumference to glove size.
AWG to diameter in mm and inches.
Needle gauge to outer diameter mm.
Fractional inch to mm and decimal.
Gauge swatch to stitches and rows.
Pieces and width to yards needed.
Map distance to real ground distance.
Decibels to power and amplitude ratio.
Aperture, shutter and ISO to EV.
Focal length and crop factor to 35mm.
Focal length and f-number to aperture.
Tire code to diameter and circumference.
Concentration to pH, pOH and nature.
Lumens and watts by bulb type.
Stack dimensions to cords of wood.
Nit, cd/m², stilb, lambert, foot-lambert.
Lumen, millilumen, kilolumen.
Candela, mcd, kcd, candlepower.
Sievert, mSv, µSv, rem, millirem.
Gray, milligray, rad, erg/gram.
Becquerel, MBq, GBq, curie, mCi.
Coulomb, mAh, Ah, faraday.
Farad, mF, µF, nF, pF.
Henry, mH, µH, nH.
Ohm, milliohm, kilohm, megohm.
Siemens, mho, mS, µS.
Volt, millivolt, kilovolt, megavolt.
Ampere, microamp, milliamp, kiloamp.
Weber, milliweber, maxwell, line.
Tesla, millitesla, gauss, milligauss.
Pa·s, poise, centipoise, mPa·s.
m²/s, stokes, centistokes.
W/m·K, BTU/hr·ft·°F, cal/s·cm·°C.
J/kg·K, kJ/kg·K, cal/g·°C, BTU/lb·°F.
W/m², BTU/hr·ft², cal/s·cm².
Katal, µkat, nkat, enzyme unit.
Mole, millimole, micromole, kilomole.
N/m, mN/m, dyne/cm, erg/cm².
kg·m/s, g·cm/s, lb·ft/s, slug·ft/s.
N·s, kg·m/s, lbf·s, dyne·s.
N/m, N/mm, lbf/in, kgf/m.
J/kg, kJ/kg, cal/g, BTU/lb, Wh/kg.
J/K, kJ/K, cal/K, BTU/°F.
K/W, °C/W, K/kW, °F·hr/BTU.
Pa, kPa, MPa, GPa, psi, ksi.
min/km, min/mi, sec/100m, sec/400m.
m³/kg, L/kg, cm³/g, ft³/lb.
kg/s, g/s, kg/h, lb/s, t/h.
rad/s, deg/s, RPM, rev/s.
Convert wavelength ↔ frequency via c = fλ.
Convert pascals ↔ decibels (dB SPL).
Fresh, active dry and instant yeast.
Water per cup by rice type.
Distance and speed to flight duration.
Gap between arrival and next departure.
Hours between two UTC offsets.
Haversine distance between two lat/long points.
Weight remaining before the allowance.
Air pressure at a given altitude.
Speed and temperature to Mach number.
Airspeed and wind to ground speed.
Wind split into cross and head parts.
Pressure altitude and temp to density altitude.
Indicated speed and altitude to TAS.
Fuel used and time to burn rate.
Altitude gained and time to feet per minute.
Altitude to lose and time to ft/min.
Distance before airport to start descent.
Burn rate and hold time to fuel used.
Departure, duration and zone to arrival time.
Knots into mph, km/h and m/s.
Nautical miles into km, miles and metres.
Distance and pace to walking time.
Distance, speed and stops to drive time.
Days, weeks and months between two dates.
Home time plus offset to local time.
Layover versus minimum connection time.
Decode named & numeric HTML entities.
Escape text into a JSON string literal.
Decode \n, \t, \uXXXX escape sequences.
Text to \uXXXX escape sequences.
Decode \uXXXX Unicode escapes.
Rotate printable ASCII by 47 places.
Text to space-separated hex codes.
Hex codes back to readable text.
Text to space-separated decimal codes.
Decimal codes back to readable text.
String into a [code, code] array.
Array of codes back to a string.
Swap big-endian and little-endian hex.
Random 21-char URL-safe unique IDs.
Words joined by hyphens, lowercased.
Words joined by underscores, lowercased.
lowerFirst, capitalized rest, no spaces.
Every word capitalized, no spaces.
UPPERCASE words joined by underscores.
Words joined by dots, lowercased.
Capitalized words joined by hyphens.
Words joined by slashes, lowercased.
Escape . * + ? and other regex chars.
Swap letters for lookalike leet digits.
Encode text with the Bitcoin Base58 set.
Decode URL-safe base64 (- and _).
URL-safe base64, no padding.
JSON object into a URL query string.
URL query string into a JSON object.
32-char MD5 checksum of any text.
40-char SHA-1 digest of any text.
64-char SHA-256 digest of any text.
8-char CRC32 checksum of any text.
8-char Adler-32 checksum of any text.
Break a URL into all its parts.
Decimal, U+, entity, UTF-8 and UTF-16.
Convert RGB colors to HSL and CSS.
Convert HSL colors to RGB and hex.
Convert HSL colors to hex codes.
Convert RGB colors to HSV / HSB.
Convert HSV / HSB colors to RGB and hex.
WCAG relative luminance from a hex color.
Opacity % to hex alpha and 8-digit hex.
Shift a hex color lighter or darker.
Opposite color on the wheel from any hex.
Blend two hex colors by any ratio.
Convert any hex color to grayscale.
Get the inverted negative of any hex color.
Black or white text for any background.
Lighter tints and darker shades from a hex.
Neighbouring hues for a harmonious palette.
Three evenly spaced hues from one hex.
Generate random hex color codes.
Convert pixels to rem for any root size.
Convert rem to pixels for any root size.
Letter-spacing px to em and tracking.
Line-height in px and unitless from a ratio.
Golden-ratio sizes from any length.
Type scale from a base size and ratio.
Pixel breakpoints to em media queries.
Padding-top % for responsive embeds.
Estimate reading time from word count.
Pure-CSS triangles with the border trick.
Build CSS text-shadow declarations.
Name/value pairs into :root custom properties.
Build responsive image srcset attributes.
MIME content type for a file extension.
Service for a well-known port number.
Compare two semantic version numbers.
Detect browser and OS from a UA string.
Selector specificity as an a,b,c triple.
Text to character codes and back.
Bitrate and duration to file size.
Bitrate and length to MP3 size.
Width, height and bit depth to size.
Target size and length to bitrate.
Target size and length to bitrate.
Bitrate and hours to GB used.
Dimensions and frames to GIF size.
Megapixels and bit depth to RAW size.
Resolution, fps and length to size.
Bit depth to image size and colors.
Duration and fps to total frames.
HH:MM:SS:FF timecode to frame number.
Frame number to HH:MM:SS:FF timecode.
Byte length to encoded size and overhead.
Original size and ratio to compressed size.
GB stored and price to storage cost.
GB transferred and price to cost.
Traffic and requests to CDN cost.
Data out minus free tier to cost.
Full and incremental backups to storage.
Disk size, count and level to usable space.
Free space and growth to time until full.
File size and speed to transfer time.
Records and bytes each to payload size.
Log rate and retention to storage.
Rows and row size to table size.
Storage and photo size to photo count.
Storage and song size to song count.
Storage and bitrate to recording hours.
Card size to photos and video time.
Bitrate and length to recording size.
Episodes and length to total storage.
Pixels and DPI to print dimensions.
Megapixels and ratio to pixel size.
Original size and new width to new height.
Resolution and fps to recommended bitrate.
V=IR and P=VI from any two values.
Vout = Vin×R2/(R1+R2).
Decode band colors to ohms and tolerance.
Series resistor = (Vs−Vf)/I.
Total = R1 + R2 + R3 + R4.
1/Rt = 1/R1 + 1/R2 + …
E = ½CV², Q = CV.
τ = R×C, full charge ≈ 5τ.
τ = L/R, steady state ≈ 5τ.
f = 1/(2π√(LC)).
E = ½LI².
P = V×I×pf, S = V×I.
P = 10^((dBm−30)/10) watts.
Copper cable drop from length & area.
AWG to diameter, area and amps.
n = Vp/Vs = Np/Ns = Is/Ip.
Vrms = Vpeak/√2 for a sine wave.
P = √3×VL×IL×pf.
Runtime = capacity/load × efficiency.
Wh = Ah × voltage.
Array watts from daily Wh & sun hours.
t = −RC×ln(1−Vc/Vs).
Single-layer air-core, Wheeler’s formula.
Quarter & half-wave from frequency.
dB = 10log(Po/Pi) or 20log(Vo/Vi).
Z = √(R²+(XL−XC)²).
Xc = 1/(2πfC).
XL = 2πfL.
pf = real power / apparent power.
kWh × rate over any period.
I = P / (V × pf).
P = V × I × pf.
kW = kVA × power factor.
R = R1×R2/(R1+R2).
P = I²R, Q = I²Rt.
SR = 2π × f × Vpeak.
Top words and density for SEO.
Character length vs SEO limits.
Title length vs 50-60 char limit.
CIDR prefix to mask, hosts and addresses.
Prefix length to dotted-decimal subnet mask.
Dotted-decimal mask to CIDR prefix length.
IPv4 address to binary and hex octets.
Classify any IPv4 as A/B/C/D/E, private or public.
Usable hosts and addresses from a CIDR prefix.
Subnets and hosts when borrowing network bits.
Inverse mask for Cisco ACLs from a prefix.
Expand :: shorthand to full 8-group IPv6.
Colon, hyphen, Cisco and bare MAC formats.
File size and speed to download duration.
Plan cost plus overage for extra gigabytes.
How much round-trip time is left for the network.
TCP maximum segment size from your MTU.
Max TCP throughput from window and RTT.
Batch transfer duration with efficiency loss.
Bandwidth and data for concurrent streams.
Usable space for RAID 0/1/5/6/10 arrays.
Does the backup fit the maintenance window?
Uptime % from period and downtime minutes.
Allowed downtime for any SLA availability %.
Combine dependent service SLAs in series.
Loss percentage and quality from packet counts.
Total bytes across a batch of HTTP requests.
Refresh rate and origin queries from a TTL.
Total link size for concurrent users.
Concurrent call bandwidth by codec.
Minimum latency from distance and medium.
Bandwidth-delay product for full link use.
IOPS and block size to throughput.
Will your traffic exceed the API quota?
Average and peak RPS from traffic totals.
Pool size from RPS and latency.
Backend pool capacity with N+1 failover.
Compress CSS by removing comments and spaces.
Shrink HTML by stripping comments and whitespace.
Compact JSON by stripping whitespace.
Delete // and /* */ comments from JS.
Collapse extra spaces, tabs and blank lines.
Extract plain text from HTML markup.
Encode text into safe HTML entities.
List H1–H6 headings as an indented outline.
Make clean URL slugs from titles.
Words, reading time and SEO length check.
Flag images with missing or empty alt.
Generate rel="nofollow" anchor tags from URLs.
Build sitemap.xml from a list of URLs.
Create Twitter/X card meta tags.
Build a rel="canonical" link tag.
Create hreflang alternate link tags.
BreadcrumbList JSON-LD structured data.
Create a mobile viewport meta tag.
Build a Cache-Control HTTP header.
Build 301/302 Apache and Nginx redirects.
Build UTM-tagged campaign URLs.
Build encoded URL query strings.
Build accessible breadcrumb nav HTML.
Preview title and description truncation.
Character and pixel length for title tags.
Check meta description length for SEO.
Check URL length and path depth.
Recommended favicon sizes and link tags.
Is an element above the fold?
Score selector specificity (a,b,c).
WCAG contrast ratio for two colors.
Check touch target size vs WCAG minimums.
font-display rules and preload snippets.
Check critical CSS against the 14KB budget.
Total page weight vs a performance budget.
Delete blank lines from any text.
Flip line order top to bottom.
Randomize the order of your lines.
Collapse repeated spaces into one.
Prefix each line with a number.
Count characters with and without spaces.
Count sentences by end punctuation.
Count paragraphs split by blank lines.
List each distinct word once.
Pull email addresses out of text.
Pull http and https links from text.
Pull phone numbers out of text.
Pull integers and decimals from text.
Pull hashtags out of any text.
Remove HTML markup, keep the text.
Strip punctuation, keep words and spaces.
Strip diacritics into plain ASCII.
Delete every digit from your text.
Swap upper and lower case letters.
Convert space runs into tab characters.
Convert tabs into spaces, any width.
Trim whitespace from every line.
Add indentation to every line.
Word-wrap text to a fixed width.
Shorten text and add an ellipsis.
Split camelCase into readable words.
Convert snake_case into Title Case.
Make tiny Unicode subscript characters.
Flip text into mirror writing.
Flip letters within each word.
Characters, words, lines, sentences, averages.
Estimate syllables in any text.
Alphabetize the words in your text.
Count occurrences of each character.
Randomly mix upper and lower case.
Convert text into 1337 leetspeak.
Author, year, title, source into APA format.
Author, title, container, publisher, year to MLA.
Author, title, city, publisher, year to Chicago.
Alphabetize and clean a reference list.
Numerology number for any name.
A lucky number from your name or date.
Memorable multi-word passphrases with a number.
Random 4, 6, or 8-digit numeric PINs.
Random whole numbers in a min-max range.
Random A-Z letters, single or in blocks.
Alphanumeric tokens of any length.
Roll d4-d100 dice and sum the results.
Batch coin tosses with heads/tails split.
Random yes/no answer to any question.
Classic random fortune-telling answers.
Pick a random item from a list.
Split names into random balanced teams.
Random gift pairings, no self-draws.
Draw a random winner from entries.
Random English words for games and prompts.
Adjective + noun + number usernames.
Random named color plus its hex code.
Random emoji, single or in a row.
Placeholder bullet list items for mockups.
Neutral filler paragraphs for mockups.
Random calendar dates for test data.
Random time of day, 24h or 12h.
Random true/false, 1/0, or on/off.
Random mutual gift-exchange pairs.
Classic B-I-N-G-O 1-75 draws.
Random 6/49-style numbers plus a bonus.
Random short motivational sayings.
Realistic first + last names for test data.
Mock JSON user records for testing.
Random hex strings for tokens and IDs.
Random IPv4 addresses for mock data.
Random MAC addresses, colon or dash.
Mock US phone numbers for test data.
Shuffle lines into random order.
Sample N unique items from a list.
Random pick weighted by name:weight lines.
Pick one option at random from your list.
Score text readability from 0 to 100.
US grade level of your writing.
Complexity from sentence and word length.
Grade level from polysyllabic words.
Character-based readability grade.
ARI grade from characters and words.
Flesch, Kincaid and Fog from counts.
Average, longest and shortest sentences.
Mean letters per word in your text.
Flag passive voice in your writing.
Find and count -ly adverbs.
Count just, really, very, actually…
Find tired, overused phrases.
Score headlines for length and impact.
Top recurring terms, minus stop words.
List the longest words by length.
Unique words over total words.
How long your script takes to say.
Silent reading time for your text.
On-screen duration for a caption.
Fit captions to platform limits.
Weighted characters against 280.
GSM-7 vs UCS-2 segments and cost.
Count total and unique emoji.
Code points vs UTF-16 units.
UTF-8 byte size of text.
Point value of words in Scrabble.
Group words that share endings.
Group words with the same letters.
Find palindrome words in text.
Count each A–Z letter with bars.
Count vowels vs consonants.
Uppercase, lowercase and CAPS words.
Spaces, tabs, breaks and trailing space.
List repeated words and their counts.
Compare two texts for similarity.
Daily carbohydrate grams from your calories.
Daily fat grams from your calories.
Recommended daily fiber from calories.
Daily deficit for a weekly loss goal.
Deficit to lose weight in a timeframe.
Calories to hold your current weight.
Ideal and adjusted weight from height.
FFMI and normalized FFMI from body fat.
BAI body-fat estimate from hip and height.
Height-cubed corrected body mass index.
Small, medium, or large frame from wrist.
Normal-BMI weight range for your height.
Date you reach your goal weight.
Healthy body-fat percentage ranges by sex.
RMR from lean mass (Katch-McArdle).
Sodium vs limits and salt equivalent.
Added-sugar limits from your calories.
Safe caffeine limit and coffee cups.
UK units from volume and ABV.
US standard drinks from volume and ABV.
Total carbs minus fiber and sugar alcohols.
GL from glycemic index and carbs.
Energy balance and weekly weight trend.
Split daily calories across meals.
Convert kilocalories and kilojoules.
Daily iron RDA by sex and age.
Percent of body weight lost.
Protein grams per meal from a daily goal.
Loading and maintenance creatine doses.
Daily electrolyte targets by sex.
%DV from amount and reference value.
Keto fat, protein, and carb grams.
Total calories from macro grams.
Hourly fluid loss during exercise.
Fat to lose for a goal body-fat percent.
Caffeine remaining after a time period.
1RM percentage training loads and reps.
Powerlifting Wilks coefficient and score.
Modern DOTS powerlifting coefficient.
Karvonen heart-rate training zone.
Fox, Tanaka, Nes and Gulati estimates.
Estimate VO₂ max from resting heart rate.
Convert pace to km/h and mph.
Predict race time with Riegel’s formula.
Finish time from pace and distance.
Even splits from a goal finish time.
Treadmill speed and incline to pace.
Swim pace per 100 m and 50 m.
Goal marathon time to required pace.
Goal half-marathon time to pace.
Goal 5K time to required pace.
VO₂ max from a 12-minute run.
Cycling watts per kilogram.
Coggan cycling power zones from FTP.
Running calories via the MET method.
Cycling calories via the MET method.
Walking calories via the MET method.
Step count to calories and distance.
Convert steps to miles and km.
Time to walk a distance at any speed.
Cadence and stride to speed and pace.
Step and stride length from distance.
Oxygen cost of running per km.
Fluid to drink during a workout.
Weekly plank hold-time plan.
Accumulated sleep debt over days.
Wake time for power and cycle naps.
Days to adjust after crossing zones.
Pregnancy weeks and days from LMP.
Estimate conception date from LMP.
Due date from scan gestational age.
Plates per side for any barbell target.
Rate your bench vs strength standards.
Rate your squat vs strength standards.
Rate your deadlift vs strength standards.
Squat + bench + deadlift total & split.
Sets × reps × weight training load.
Percentage-based training max from 1RM.
Reps + RPE → %1RM and estimated max.
Rest ranges by training goal.
Maintenance + surplus for lean bulking.
Maintenance − deficit for fat loss.
Maintenance calories + high protein for recomp.
Ramp calories back up week by week.
Training vs rest day macro targets.
Weekly sets & volume load per muscle.
Project weight gains over weeks.
Grip strength per kg of bodyweight.
Peak power from jump height (Sayers).
Jump distance relative to height.
Distance & time → m/s, km/h, mph.
Mechanical work in joules from lifting.
Realistic monthly muscle-gain potential.
Weekly average from high & low days.
High-carb refeed calories & carb target.
Daily protein from g/kg bodyweight.
High / medium / low carb-day grams.
Reduced load & sets for a deload.
Lift as a multiple of bodyweight.
Compare two lifters per unit bodyweight.
Fair strength score across bodyweights.
MV/MEV/MAV/MRV weekly sets per muscle.
Reps × tempo → seconds under load.
Volume load per minute of training.
MET-based calories burned lifting.
Total body water & daily fluctuation.
General daily & pre-workout sodium range.
MAP from systolic and diastolic BP.
Systolic minus diastolic pressure.
Perfusion pressure from a BP reading.
Albumin-adjusted serum calcium.
Na − (Cl + HCO3) from electrolytes.
Kidney filtration from creatinine.
Cockcroft-Gault clearance estimate.
Heart-rate corrected QT interval.
Friedewald LDL from a lipid panel.
Total-to-HDL cholesterol ratio.
HbA1c to estimated average glucose.
Average glucose to estimated HbA1c.
Nadler total blood volume estimate.
Drops per minute for an IV infusion.
Weight-based mg dose and volume.
Weight-based daily and per-dose amounts.
Dose from body surface area.
Minutes of oxygen left at a flow rate.
Newborn 0-10 condition score.
Consciousness score from 3 to 15.
Adult burn surface area estimate.
Burn fluid resuscitation over 24h.
Holliday-Segar 4-2-1 fluid needs.
Sodium needed to reach target level.
Calculated osmolality from labs.
HCO3 needed to reach target.
Heart rate over systolic pressure.
Devine ideal weight from height.
Dosing weight from IBW and actual.
Fractional excretion of sodium.
Water needed to correct hypernatremia.
Sodium adjusted for hyperglycemia.
Corrected retic and production index.
ANC from WBC and neutrophil %.
Serum iron over TIBC, as a percent.
MCV divided by red cell count.
Weeks pregnant from your last period.
Trimester start and end dates.
How many diapers to stock up.
Daily formula from baby’s weight.
Weight-for-age percentile, 0–24 months.
Length-for-age percentile, 0–24 months.
Head circumference percentile by age.
Weight-for-age percentile, ages 2–6.
Adult height from parents’ heights.
Even feeding times across the day.
Recommended sleep and naps by age.
Typical nap count and next transition.
Safe storage times for expressed milk.
How long gradual weaning takes.
Bottles needed from daily ounces.
Solid-food meals and portions by age.
Daily fluid needs for children.
Daily calories by age and activity.
Baby age in months, weeks and days.
Typical baby tooth eruption order.
Estimated childhood vaccine visit dates.
Recommended screen limits by age.
Readiness from age and signs.
Recommended car seat stage by size.
Pitcher earned run average from ER and IP.
Hits divided by at-bats (.XXX).
Total bases per at-bat (SLG).
On-base plus slugging percentage.
Walks + hits per inning pitched.
Hollinger single-game efficiency rating.
Scoring efficiency including free throws.
Official QB rating, 0 to 158.3.
College passer efficiency rating.
Differential and index from a round.
League average and handicap score.
Minimum darts to finish a score.
Scoring average per game played.
Winning percentage from W-L-T record.
Games needed to clinch a division.
Expected win % from points scored/allowed.
New Elo after a match result.
Age-graded race performance percentage.
Sum swim, bike, run and transitions.
Swim pace per 100 metres and speed.
Strokes per minute and 500m split.
Cycling power-to-weight ratio (W/kg).
Max touch height and hang time.
Football fantasy scoring (PPR toggle).
Goal difference and league points.
Current and required run rate.
Game win probability from point odds.
Goalie save % from shots and goals.
Total xG vs actual goals scored.
Days, weeks and months between two dates.
Duration between two clock times.
Add days to a date for the result.
Subtract days from a date for the result.
Add hours to a clock time.
Ordinal day number within the year.
Which quarter a date falls in.
Find the next leap year.
Mon-Fri working days between dates.
Saturdays and Sundays between dates.
Difference between two UTC offsets.
Epoch timestamp to readable UTC date.
Calendar date to epoch timestamp.
Total days between birth and a date.
Decimal hours into H:M:S format.
Hours, minutes, seconds to decimal hours.
Days remaining until a target date.
Human-friendly elapsed-time phrase.
Hours worked from clock-in, clock-out and breaks.
Invoice amount from billable hours and rate.
Annual cost of a recurring team meeting.
Quote from hours, rate, contingency and expenses.
Sum a list of time sessions into a total.
PTO balance from accrual rate and hours used.
Prorated vacation days from months worked.
Regular and overtime pay from total hours.
Premium pay from a shift differential percentage.
Convert a meeting time between UTC offsets.
Fiscal quarter for a date and FY start month.
Week number within a fiscal year from a date.
Days in any month, with leap-year support.
Days, hours and minutes between two datetimes.
Duration as a percentage of a day.
Total time for a run of pomodoro cycles.
Working days and capacity hours in a sprint.
Add business days to a date for a deadline.
Turnaround between request and resolution vs SLA.
Monthly hours needed to cover fixed costs.
Hours to reach an income goal at your rate.
Annual work hours after holidays and vacation.
Real hourly rate from an annual salary.
Weeks to reach an hours goal at a weekly pace.
Focus ratio from deep-work vs total hours.
Time and money lost to context switching.
How many focus blocks fit in available hours.
FTE and percentage from part-time hours.
Hours for an overnight shift across midnight.
Standby plus call-out pay for on-call work.
Pay for hours at a double-time multiplier.
Premium pay for hours worked on a holiday.
Cash value of accrued or banked hours.
Convert minutes into decimal hours.
Round clock times to payroll intervals.
Average weekly hours from a list of weeks.
Rolls needed from perimeter and roll size.
Boxes needed from area and coverage.
Planks needed from area and plank size.
Carpet length, area and cost estimate.
Mulch volume and bags from bed size.
Topsoil volume and tonnes from area.
Gravel volume, tonnes and bags.
Turf rolls needed from lawn area.
Seed weight from lawn area and rate.
Fertilizer and nitrogen from area.
Boards and linear metres for a deck.
Posts, panels and rails for a fence.
Bricks needed from wall area.
Plasterboard sheets from wall area.
Angle and slope factor from rise/run.
Weighted GPA from grades and credits.
Score needed on your final exam.
Running cost from wattage and rate.
Scale ingredient amounts up or down.
Tested swaps with exact amounts.
Flour-relative percentages to gram weights.
Roast time from weight and doneness.
Fridge or cold-water thaw by weight.
Roast time for stuffed or unstuffed.
Steak grill time per side.
Cook time from thickness and doneness.
Salt for a wet brine by volume.
Dough hydration from flour and water.
Flour, water, salt and yeast per balls.
Spirit, sour and sweet by ratio.
Temp, time and leaves per tea type.
Dry pasta by people and portion.
Which pizza is the better deal.
Recipe calories divided by servings.
Ingredient cost against menu price.
Total food for a guest count.
Servings from a round cake diameter.
How much replacer per egg.
Swap white sugar for sweeteners.
Swap all-purpose for other flours.
Flour and water to feed a starter.
Equilibrium brine salt weight.
How long to marinate each protein.
Smoke time and target temp by cut.
Oil temp and time per food.
Altitude-adjusted candy temperature.
Sugar and vanilla for whipped cream.
Sugar and milk for buttercream.
Cream for chocolate by use.
Flour and fat to thicken liquid.
Water and mirepoix from bones.
Damped scaling for seasonings.
Yearly bill savings from a solar array.
Panels needed for a target system size.
Backup runtime from battery capacity.
Generator size from running and surge watts.
Electricity cost from monthly kWh used.
Gas bill from therms and price.
Water bill from gallons used.
Cost to heat a home all season.
Cost to run air conditioning.
Savings from a higher R-value.
CO2 from power, gas and driving.
Carbon emissions of a flight.
Carbon emissions from driving.
Trees needed to offset CO2.
Yearly cost of standby power draw.
Yearly savings from switching to LED.
Yearly water and cost of showers.
Yearly water used by flushing.
Gallons in a rectangular pool.
Chlorine needed to hit target ppm.
Cost to raise pool temperature.
Monthly cost to run a hot tub.
How long a propane tank lasts.
Pellet bags and cost per season.
Heating savings from a setback.
Home charging cost for an EV.
Savings vs electric resistance heat.
Yearly cost of heating water.
Cost to run a clothes dryer.
Water use: dishwasher vs hand.
Energy, cost and CO2 of standby draw.
Monthly kWh and cost of an appliance.
Yearly cost: gas vs electric heat.
Carbon emissions from electricity use.
Years for solar to pay for itself.
Water harvested and cost saved.
How many days you have lived.
Weeks lived versus weeks remaining.
Total heartbeats from age and heart rate.
Total breaths from age and breathing rate.
Recommended sleep hours for your age.
Your zodiac animal and element.
Birthstone and flower for each month.
Your generation from your birth year.
Where your height ranks among adults.
Yearly cost of your coffee habit.
Yearly cost of cigarettes.
Yearly spend on alcohol.
Yearly cost of bottled water.
The value of your daily screen time.
Total up all your monthly subscriptions.
True yearly cost of a new phone.
Spend per person from a gift budget.
Cost per person for a shared gift.
Allocate a wedding budget by category.
Split road-trip fuel cost per person.
Fair tip share by hours worked.
How many drinks to buy for guests.
How many pizzas to order for guests.
How much ice to buy for guests.
Cups, napkins and plates to buy.
How many tables to seat your guests.
Dishes and drinks to cover a potluck.
Snacks and drinks to pack per trip.
Boxes needed to pack your home.
The value of your unpaid housework.
Hours and days spent commuting yearly.
Yearly hours spent watching movies.
Books you can finish in a year.
Steps and days to cover a marathon.
Plants per bed from spacing and dimensions.
Seeds needed adjusted for germination.
Plants and yield from row layout.
Cubic feet, yards and bags for a bed.
Volume from area and spread depth.
Browns needed for balanced compost.
Net turf area in sq ft, sq m, acres.
Gallons to reach a target watering depth.
BTU/hr heat loss for a greenhouse.
Daily GDD from temps and base.
Lime to raise pH by soil type.
Product needed for a target N rate.
Flock feed in pounds and bags.
Water needs by animal type and count.
Bales needed from ration and days.
Total yield and revenue from acreage.
GPM and GPH from a fill test.
Gallons harvested from roof and rain.
Light hours for a target DLI.
Indoor sowing date from last frost.
Transplant date from sow date.
Potting mix for round containers.
Perc rate from a drop-in-time test.
Concentrate and water for a spray mix.
Bin area and worms from food scraps.
Gallons and liters from pond size.
Water applied per drip run.
Plants per acre from spacing.
Lime pounds and bags for an area.
Gypsum pounds and tons per acre.
Seed needed from rate and acres.
Trees per acre from spacing.
CO2 to enrich a greenhouse.
Vapor pressure deficit from temp and RH.
Frost risk and degrees of cover needed.
ROI and net savings for a garden.
Near, far and total DoF for any lens.
Max depth of field focus point.
Field of view from focal length and sensor.
Full-frame equivalent focal and aperture.
EV from aperture and shutter speed.
New shutter speed for a new aperture.
Shutter speed for any aperture in sun.
Long-exposure time from ND stops.
Aperture and range from a flash GN.
Print dimensions from pixels and DPI.
Largest print size from your MP.
Megapixels from image dimensions.
Simplest ratio from width and height.
Max star shutter from focal length.
Accurate max star shutter time.
Clip length from interval and duration.
Interval for a target clip length.
Airy disk and diffraction-limited aperture.
Extra exposure from magnification.
File size from bitrate and duration.
Bitrate from target size and duration.
GB per hour from video bitrate.
Colors possible from a bit depth.
Stops between two f-numbers.
Stops between two shutter speeds.
Stops between two ISO values.
Scene coverage at a subject distance.
Magnification from focal and distance.
Optimal distance for a print resolution.
Crop factor from sensor dimensions.
Photos per card from average file size.
PPI from resolution and screen size.
Raw file size from pixels and bit depth.
Duration from frames and frame rate.
MP required for a print size and DPI.
Total and per-frame film cost.
Lens needed to frame a subject width.
Stops and guide number from power fraction.
Added magnification from extension tubes.
Achievable DPI from MP and print size.
Shutter speed from angle and frame rate.
Recording time from card size and bitrate.
Convert focal length between units.
Convert bitrate between units.
Convert file sizes between units.
Note-synced delay times from your tempo.
Reverb pre-delay and decay from tempo.
Note name and octave into Hz.
MIDI number into frequency in Hz.
Nearest note and cents off from Hz.
Interval in cents from two frequencies.
Semitones into a frequency ratio.
Shift a pitch by semitones.
Shift a pitch by whole octaves.
PCM size from rate, depth and length.
Compressed size from bitrate and length.
Max minutes from file size and bitrate.
Gain in dB into an amplitude ratio.
Amplitude ratio into decibels.
Add two sound levels in decibels.
SPL drop over distance, inverse-square.
Wavelength from frequency and speed.
Length of a bar from tempo and meter.
Samples per beat from tempo and rate.
Minutes per side from groove and RPM.
Playing time from tape length and speed.
Retune concert pitch from 440 Hz.
Overtone frequencies above a fundamental.
Headroom in dB below the ceiling.
Gain in dB to hit a LUFS target.
Tempo from milliseconds between beats.
Convert dBu into dBV and voltage.
Latency from buffer size and rate.
Delay in ms from speaker distance.
Mobile data from bitrate and hours.
Length of a note value from tempo.
Pitch shift from a playback speed change.
Cents into a frequency ratio.
Frequency into a MIDI note number.
Sample count into a duration.
Tempo into an LFO frequency in Hz.
Clicks and bars from tempo and length.
Loop length from tempo, bars and rate.
Semitones into cents and a ratio.
Italian tempo marking from a BPM.
How a dB change sounds to the ear.
First-order crossover from R and C.
Convert Hz, kHz and MHz.
Convert bytes, KB, MB and GB.
Convert bps, kbps and Mbps.
Grams of filament from length and diameter.
Meters of filament from weight and diameter.
Filament cost of a print from grams used.
Filament left on a spool by length.
How many prints one spool yields.
Rough print time from volume and flow.
Number of layers from height and layer height.
Power cost of a print from watts and hours.
Material, power, wear and labor combined.
Resin cost of a model from mL used.
Flow from width, layer height and speed.
Top speed from flow, width and layer height.
Line width from nozzle diameter and factor.
New dimensions from a scale percentage.
Scale percent to reach a target size.
Weight and cost from a model volume.
Scale-up to offset material shrinkage.
First layer height vs nozzle diameter.
Probe points and spacing for a mesh.
Filament weight from gross minus empty.
Plan hotend temps for a calibration tower.
Bed power and current from area.
Cool-down time to a safe temperature.
Steps/mm for a belt-driven axis.
Steps/mm for a lead-screw Z axis.
Belt length from centres and pulley teeth.
Linear travel from lead and turns.
Plastic volume from solid volume and infill.
Cross-section area from filament diameter.
Convert mm, cm, inches, feet and thou.
Convert grams, kilograms, ounces and pounds.
Convert microns, millimeters and thou.
New flow from measured wall thickness.
New E-steps from a measured extrusion.
Price per meter from spool price and weight.
Prints per farm from uptime and time.
Resin layers and time from exposure settings.
Grams per hour from volumetric flow.
Slowdown to meet a minimum layer time.
Percent of a spool left by weight.
Sell price from cost plus a markup.
Strip comments and blank lines from G-code.
Convert cm3, mL, cubic inches and liters.
Convert mm/s, mm/min and inches per second.
Effective DPI from DPI and sensitivity.
Turn distance from DPI, sens and yaw.
Match sens between two games by yaw.
In-game sens for a target cm/360.
Physical distance from DPI and counts.
Report interval from mouse Hz.
vFOV from hFOV and aspect ratio.
hFOV from vFOV and aspect ratio.
Stretch factor for a render resolution.
Image width and side bars, no stretch.
Frame time in ms from FPS.
FPS from a frame time in ms.
Frame budget in ms from monitor Hz.
Does response time fit one frame?
Peripheral, render and display latency.
Chance of at least one hit in N pulls.
Average pulls for the first hit.
Average kills and odds for a rare drop.
Pulls and cost to reach pity.
Pulls you can afford from your balance.
XP remaining to your target level.
Days to finish from XP per day.
DPS from damage, speed and crits.
Health after armor reduction.
Average hit with crit factored in.
TTK from target HP and your DPS.
Farming rate from a session.
Hours to reach a currency goal.
Average value per box opened.
Kill/death ratio from your stats.
(Kills + assists) / deaths.
Win percentage from your record.
Headshot rate from your kills.
Hit rate from shots fired.
GB per hour from stream bitrate.
Upload time from file size and speed.
File size from bitrate and duration.
Spare upload above your stream bitrate.
Revenue from cheered bits.
Take-home subs after the platform cut.
Stream income per hour streamed.
Progress and amount left to raise.
Total outbound for all viewers.
Download time from size and speed.
Streaming hours before a data cap.
Total latency from ping, tick and frame.
Update interval from server tickrate.
kbps, Mbps, MB/s and GB per hour.
Dog to human years by breed size.
Convert cat years to human years.
Daily kcal from weight and activity.
Daily kcal from weight and status.
Cups per day from calories and kcal/cup.
Daily food from calories and kcal/cup.
Estimate grown weight from current size.
Daily water need from body weight.
Daily water need from body weight.
Theobromine risk by chocolate type.
Xylitol risk by dose and dog weight.
Diphenhydramine dose by dog weight.
Weight-based dose in mg and ml.
Check if a food is safe for dogs.
Gallons and liters of a rectangular tank.
Gallons and liters of a round tank.
Gallons, liters and cubic feet.
Fish capacity by the inch-per-gallon rule.
Heater size from liters and temp rise.
Volume to change from tank size and percent.
Freshwater salt by tank size and strength.
Salt mix for a target saltwater salinity.
Water surface area for gas exchange.
Filled weight from volume and substrate.
Premiums versus expected vet payout.
Daily, monthly and yearly food cost.
How long a bag of food lasts.
Treat calories by the 10 percent rule.
Owner calories burned on a dog walk.
Weight from heart girth and body length.
Daily ration as a percent of body weight.
Daily pellets and greens by weight.
Daily vitamin C needs by body weight.
Daily food as a share of body weight.
Safe bar spacing by bird species.
Boxes by the one-per-cat-plus-one rule.
Monthly litter use by cats and type.
Development stage from age in weeks.
Days remaining by species and days bred.
Starting basking bulb wattage estimate.
Minimum floor area by species and count.
Minimum crate length and height.
Convert pet age to months and weeks.
Paw safety from air temperature.
Typical vaccines due by age in weeks.
From pressure altitude and temperature.
From elevation and altimeter setting.
Crosswind and headwind for a runway.
TAS from IAS with the 2% rule.
Ground speed from TAS and wind.
Dew point from temp and humidity.
Humidity from temp and dew point.
Cloud base from temp / dew point spread.
How cold it feels with the wind.
How hot it feels with humidity.
Apparent temp from heat, humidity, wind.
Wet-bulb from temp and humidity.
Standard temperature at any altitude.
OAT versus standard temperature.
Speed of sound at any altitude.
Mach from true airspeed and altitude.
Descent rate for a glideslope angle.
Where to start your descent.
Gradient from altitude loss and distance.
Gradient and rate from height and distance.
Flight time from fuel and burn rate.
Fuel for a distance plus reserve.
Nautical miles per gallon of fuel.
Distance between two lat/lon points.
True course between two lat/lon points.
Beaufort force from wind speed.
Altitude error from a wrong setting.
Adjust takeoff distance for conditions.
Crab angle and ground speed from wind.
Fuel gallons into pounds and kilograms.
Time en route from distance and speed.
Time and distance you can still turn back.
Air density from pressure and temperature.
Grams of water vapor per cubic meter.
Humidex from temperature and dew point.
Bank angle for a standard rate turn.
Turn radius from speed and bank angle.
Celsius, Fahrenheit and Kelvin at once.
Temperature aloft from a lapse rate.
Gust factor and approach speed additive.
Vapor pressure and deficit from humidity.
Knots, mph, km/h and m/s.
Altitude in feet, meters and kilometers.
Nautical miles, km and statute miles.
inHg, hPa, millibars and mmHg.
Statute miles, km, meters, nautical miles.
Quick arcade and puzzle games to pass the time. No sign-up, no ads, nothing installed — each one runs entirely in your browser, on any device.
Grow the snake, don’t bite your tail.
Stack falling blocks, clear the lines.
Munch the pellets, dodge the ghosts.
Bounce the ball, smash every brick.
Classic paddle duel against the CPU.
Blast the descending alien waves.
Blast & dodge the drifting rocks.
Dogfight the swooping squadrons.
Shoot the crawler in the mushrooms.
Intercept the incoming barrage.
Cross the road and the river home.
Tap to flap through the gaps.
Bounce ever higher up the platforms.
Match 3 to pop the bubble wall.
Flip, bump & rack up the score.
Slide and merge tiles up to 2048.
Flip the cards, find every pair.
Clear the field, flag the mines.
Fill the grid, 1–9, no repeats.
Slide the tiles back into order.
Toggle cells to kill every light.
Solve the picture from the clues.
Push every crate onto its spot.
Move the stack in the fewest moves.
Link the dots, fill the board.
Swap gems, line up 3 to clear.
Find the hidden words in the grid.
Match free tiles to clear the board.
Classic Klondike, draw 1 or 3.
Beat the dealer, hit 21.
Jacks-or-better, hold & draw.
Roll for the best dice combos.
Beat the unbeatable AI, or a friend.
1, 2 or 4 suits — clear the columns.
Nearly every deal is winnable.
Press your luck with the dice.
Flank & flip to own the board.
Five in a row to win.
Drop discs, line up four.
Jump, capture & crown kings.
Close boxes to claim them.
Take the last one — or don’t.
Sow the stones, fill your store.
Sink the hidden enemy fleet.
Roll, climb & slide to 100.
Crack the 5-letter word in 6 tries.
Guess the word before it’s too late.
Unscramble the letters, beat the clock.
Bite-size clued crosswords.
How fast can you type? WPM & accuracy.
Bop the moles before they duck.
Repeat the growing color sequence.
Test your reflexes in milliseconds.
Click the targets, track your accuracy.
Best the CPU — classic or Spock.
Jump the obstacles, chase the distance.
Run, jump & grab the coins.
Build towers, hold back the waves.
A rotating set of our tools, free to download for a limited time. No sign-up required.
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Each engagement is scoped, designed, and built for your context. No off-the-shelf compromises.
Bespoke applications and platforms built to your exact workflows — from product to delivery.
Hardened connectivity, VPN, and identity — zero-trust access designed in from the start.
Resilient, observable infrastructure on cloud and bare metal — sized to scale without waste.
Pipelines, dashboards, and workflow automation that turn raw data into decisions.
Connected devices and edge compute — instrumented, secured, and managed at the boundary.
Pragmatic AI and machine learning, embedded where it measurably moves the work forward.
We start with your constraints, not a template. The solution earns every line it contains.
Systems that stay legible and maintainable years after launch — not just on day one.
Security, observability, and stewardship are part of the build, never an afterthought.
Tell us about the problem worth solving. We’ll bring the engineering to match it.
arowana33@gmail.comTell us what would make Jupiter2u more useful — a new free tool or feature, a specific data set, a service, or a custom computing / programming job. It lands straight in our queue and we’ll follow up if you leave an email.