Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
How old am I
exact age in years, months and days
POST /life/how-old-am-i$0.002Developer Utilities
Idling fuel consumption calculator
fuel burned while parked
POST /life/idling-fuel-consumption$0.002Developer Utilities
Jeans size
US, EU and international from waist and hip
POST /life/jeans-size$0.002Developer Utilities
Keystrokes per hour calculator
typing speed from count and time
POST /life/keystrokes-per-hour$0.002Developer Utilities
Linear inches calculator
luggage L+W+H for airline limits
POST /life/linear-inches$0.002Developer Utilities
Louise Gluck poetry stats
lines, words, syllables
POST /life/louise-gluck-poetry$0.002Developer Utilities
Microwave wattage
cook time conversion
POST /life/microwave-wattage$0.002Developer Utilities
Hours to minutes converter
hours into total minutes, free
POST /life/minute$0.002Developer Utilities
Month counter
whole months between two calendar months, free
POST /life/month-counter$0.002Developer Utilities
Money weight calculator
cash bill weight in grams, free
POST /life/money-weight$0.002Developer Utilities
Nautical mile converter
km, statute miles and meters, free
POST /life/nautical-mile$0.002Developer Utilities
Number of days between dates
include or exclude endpoints
POST /life/number-days$0.002Developer Utilities
Paper thickness calculator
per-sheet caliper from a stack
POST /life/paper-thickness$0.002Developer Utilities
Paper weight calculator
stack kg from sheets, size and gsm
POST /life/paper-weight$0.002Developer Utilities
Podcast backlog calculator
total listening hours at playback speed
POST /life/podcasts$0.002Developer Utilities
Pool salt calculator
kilograms to reach a target salinity
POST /life/pool-salt$0.002Developer Utilities
Price per acre calculator
land cost
POST /life/price-per-acre$0.002Developer Utilities
Price per linear foot calculator
unit price from length, free
POST /life/price-per-linear-foot$0.002Developer Utilities
Quarantine books calculator
how many books you can finish
POST /life/quarantine-books$0.002Developer Utilities
Quilt yardage calculator
fabric yards and block count
POST /life/quilt$0.002Developer Utilities
Reading speed calculator
WPM and book time from a timed sample
POST /life/reading-speed$0.002Developer Utilities
Retirement countdown
years, months and days left
POST /life/retirement-countdown$0.002Developer Utilities
RPM calculator
wheel or engine RPM from speed and tire
POST /life/rpm$0.002Developer Utilities
SAT score calculator
total from section scores
POST /life/sat-score$0.002Developer Utilities
Shower cost calculator
duration, flow, water, heating
POST /life/shower-cost$0.002Developer Utilities
Silver lining calculator
plating thickness from mass, free
POST /life/silver-lining$0.002Developer Utilities
Social media time alternatives
equivalent books and workouts
POST /life/social-media-time-alternatives$0.002Developer Utilities
Sock loss index calculator
percent of socks lost per month, free
POST /life/socks-loss-index$0.002Developer Utilities
Standing desk height calculator
desk and monitor from your height
POST /life/standing-desk-height$0.002Developer Utilities
Star Wars marathon calculator
total watch hours and minutes
POST /life/star-wars-marathon$0.002Developer Utilities
Tablecloth size calculator
cloth length and width from table and drop
POST /life/tablecloth-size$0.002Developer Utilities
Tesla charging cost calculator
SOC, kWh, and electricity price
POST /life/tesla-charging-cost$0.002Developer Utilities
TikTok time alternatives
equivalent books and workouts
POST /life/tiktok-time-alternatives$0.002Developer Utilities
Time adder
add hours, minutes and seconds, free
POST /life/time-adder$0.002Developer Utilities
Time duration calculator
add or subtract hours minutes seconds
POST /life/time-duration$0.002Developer Utilities
Time in between
days, hours and minutes between dates
POST /life/time-in-between$0.002Developer Utilities
Toilet paper calculator
days a household supply lasts
POST /life/toilet-paper$0.002Developer Utilities
Toothpaste tube calculator
how many days a tube lasts
POST /life/toothpaste$0.002Developer Utilities
UK to US shoe size converter
men and women, free
POST /life/uk-us-shoe-size$0.002Developer Utilities
TV series duration calculator
total viewing hours from seasons
POST /life/tv-series-duration$0.002Developer Utilities
Vacation countdown
days remaining until your trip
POST /life/vacation-countdown$0.002Developer Utilities
Wedding countdown
years, months and days left
POST /life/wedding-countdown$0.002Developer Utilities
Well volume calculator
gallons from diameter and water depth
POST /life/well-volume$0.002Developer Utilities
Wheel horsepower calculator
crank power to driven wheels
POST /life/wheel-horsepower$0.002Developer Utilities
Wizarding currency converter
galleons, sickles and knuts
POST /life/wizarding-currency$0.002Developer Utilities
Words per minute calculator
typing speed from words and time
POST /life/words-per-minute$0.002Developer Utilities
Yes or no
deterministic answer from your question
POST /life/yes-or-no$0.002Developer Utilities
A/B test calculator
two-proportion z-test, z-score and p-value
POST /stat/ab-test$0.002Developer Utilities
Ascending order
sort numbers from smallest to largest
POST /stat/ascending-order$0.002Developer Utilities
Benford's law calculator
leading-digit expected frequency %
POST /stat/benfords-law$0.002Developer Utilities
Bonferroni correction calculator
adjusted alpha α/m, free
POST /stat/bonferroni-correction$0.002Developer Utilities
Basal area calculator
stand G from DBH and trees per hectare
POST /bio/basal-area$0.002Developer Utilities
Cat chocolate toxicity calculator
theobromine dose and risk level
POST /bio/cat-chocolate-toxicity$0.002Developer Utilities
Cell dilution calculator
sample and diluent volumes for suspensions
POST /bio/cell-dilution$0.002Developer Utilities
Cow gestation calculator
breeding date to expected calving
POST /bio/cow-gestation$0.002Developer Utilities
DNA to mRNA converter
transcribe T to U, free
POST /bio/dna-to-mrna$0.002Developer Utilities
Dog heat cycle calculator
next heat start window
POST /bio/dog-heat-cycle$0.002Developer Utilities
Dog raisin toxicity calculator
risk from weight and dose
POST /bio/dog-raisin-toxicity$0.002Developer Utilities
Fish oil dosage for cats
daily EPA/DHA milligrams
POST /bio/fish-oil-dosage-for-cats$0.002Developer Utilities
Guinea pig age calculator
human-equivalent years, free
POST /bio/guinea-pig-age$0.002