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
Two's complement
signed integer to fixed-width binary, free
POST /math/twos-complement$0.002Developer Utilities
Unit rate calculator
rate per unit from total and count
POST /math/unit-rate$0.002Developer Utilities
Vector calculator
magnitude and direction from x and y
POST /math/vector$0.002Developer Utilities
Vector addition calculator
add two vectors by components
POST /math/vector-addition$0.002Developer Utilities
Volume calculator
cube, box, sphere, cylinder, cone
POST /math/volume$0.002Developer Utilities
Volume of a triangular prism
V from base, triangle height and length
POST /math/volume-of-a-triangular-prism$0.002Developer Utilities
Width of a rectangle calculator
from area and length, free
POST /math/width-of-a-rectangle$0.002Developer Utilities
Y-intercept calculator
find b from slope and a point
POST /math/y-intercept$0.002Developer Utilities
Add time calculator
sum two hours minutes seconds durations
POST /life/add-time$0.002Developer Utilities
Add hours to a time
new clock and day offset, free
POST /life/adding-hours$0.002Developer Utilities
Age calculator
whole years from two dates, free
POST /life/age$0.002Developer Utilities
Age in hours calculator
convert years to hours (365.25 days/year)
POST /life/age-in-hours$0.002Developer Utilities
Age in seconds calculator
convert years to total seconds
POST /life/age-in-seconds$0.002Developer Utilities
Age in years, months and days
exact civil age from two dates
POST /life/age-in-years-months-and-days$0.002Developer Utilities
Days until birthday
next birthday countdown from a birth date
POST /life/age-to-birthday$0.002Developer Utilities
Appliance wattage calculator
daily electricity cost from watts
POST /life/appliance-wattage$0.002Developer Utilities
Baby age calculator
weeks and months from two dates
POST /life/baby-age$0.002Developer Utilities
Balloon arch calculator
balloons needed from length in feet
POST /life/balloon-arch$0.002Developer Utilities
Bathroom mirror size
width height coverage
POST /life/bathroom-mirror-size$0.002Developer Utilities
Beauty product lasts calculator
days of use from size and daily amount
POST /life/beauty-products$0.002Developer Utilities
Bed size calculator
mattress dimensions
POST /life/bed-size$0.002Developer Utilities
Binge-watching calculator
hours and days to finish a series
POST /life/binge-watching$0.002Developer Utilities
Birth year calculator
year of birth from age, free
POST /life/birth-year$0.002Developer Utilities
Birthday weekday calculator
what day your birthday falls on
POST /life/birthday$0.002Developer Utilities
Bold text
wrap a string in ** markdown, free
POST /life/bold-text$0.002Developer Utilities
Bra size calculator
band and cup from underbust and bust
POST /life/bra-size$0.002Developer Utilities
Brake-specific fuel consumption calculator
BSFC in g/kWh, free
POST /life/brake-specific-fuel-consumption$0.002Developer Utilities
Calendar countdown
days until an event date, free
POST /life/calendar-countdown$0.002Developer Utilities
Chronological age calculator
years, months and days
POST /life/chronological-age$0.002Developer Utilities
Circle skirt calculator
fabric radius and hem
POST /life/circle-skirt$0.002Developer Utilities
Clock duration calculator
elapsed hours and minutes, free
POST /life/clock-duration$0.002Developer Utilities
CM to ring size converter
finger circumference to US, UK, EU
POST /life/cm-to-ring-size-converter$0.002Developer Utilities
Cord wood calculator
stack cords from length, height, and depth
POST /life/cord-wood$0.002Developer Utilities
Cost per mile calculator
trip and vehicle cost
POST /life/cost-per-mile$0.002Developer Utilities
Count hours calculator
elapsed hours between two times, free
POST /life/count-hours$0.002Developer Utilities
Crosswind component
runway wind split
POST /life/crosswind$0.002Developer Utilities
Curtain size calculator
fabric width and length from your window
POST /life/curtain-size$0.002Developer Utilities
Mobile data usage calculator
remaining MB and percent used, free
POST /life/data-usage$0.002Developer Utilities
Date of birth calculator
estimate birth date from age
POST /life/date-of-birth$0.002Developer Utilities
Date to date calculator
years, months and days between dates
POST /life/date-to-date$0.002Developer Utilities
Days until calculator
how many days left until a future date
POST /life/days-until$0.002Developer Utilities
Days until December
remaining days until next December 1
POST /life/days-until-december$0.002Developer Utilities
Decimal time conversion
hours ↔ HH:MM:SS, free
POST /life/decimal-time-conversion$0.002Developer Utilities
Diaper calculator
how many you need from age, changes, days
POST /life/diaper$0.002Developer Utilities
Drive time calculator
trip duration from distance and speed
POST /life/drive-time$0.002Developer Utilities
Elapsed time calculator
duration between two timestamps, free
POST /life/elapsed-time$0.002Developer Utilities
English learning calculator
days from your level to a CEFR target
POST /life/english-learning$0.002Developer Utilities
EU to US shoe size converter
men and women, free
POST /life/eu-us-shoe-size$0.002Developer Utilities
Flight radiation calculator
cosmic dose from hours and rate
POST /life/flight-radiation$0.002Developer Utilities
Fuel consumption calculator
liters per 100 km from trip figures
POST /life/fuel-consumption$0.002Developer Utilities
Garbage bag size
recommended gallons from can height, width and depth
POST /life/garbage-bag-size$0.002Developer Utilities
Gas calculator
trip fuel volume and total cost
POST /life/gas$0.002Developer Utilities
Glove size
knuckle circumference in inches to XS–XXXL, free
POST /life/glove-size$0.002Developer Utilities
GMAT score calculator
total from quant and verbal, 200–800
POST /life/gmat-score$0.002Developer Utilities
Hair growth calculator
projected length after months, free
POST /life/hair-growth$0.002Developer Utilities
Hammock hang calculator
mounting height from spacing and sag
POST /life/hammock-hang$0.002Developer Utilities
Helium balloons calculator
lift and volume
POST /life/helium-balloons$0.002Developer Utilities
Hot tub cost calculator
monthly electricity from heater watts
POST /life/hot-tub-cost$0.002Developer Utilities
Hours calculator
hours worked minus breaks, free
POST /life/hours$0.002Developer Utilities
Hours and minutes converter
decimal hours to hours and minutes
POST /life/hours-minutes$0.002