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
Meeting cost per minute calculator for teams
POST /biz/meeting-cost-per-minute$0.002Developer Utilities
Person-hours effort calculator for project labor
POST /biz/person-hours-effort$0.002Developer Utilities
Pomodoro Total Break Time Calculator
Short and Long Breaks
POST /biz/pomodoro-break-time$0.002Developer Utilities
Rotating meeting facilitator calculator
round-robin meeting owner
POST /biz/rotating-meeting-owner$0.002Developer Utilities
Rotating shift schedule planner
four-on four-off roster from a cycle
POST /biz/rotating-shift$0.002Developer Utilities
Schedule variance calculator
SV and SPI from EV and PV
POST /biz/schedule-variance$0.002Developer Utilities
Tasks per day target calculator
finish by your deadline
POST /biz/tasks-per-day-target$0.002Developer Utilities
Team sprint capacity calculator
hours from headcount and focus factor
POST /biz/team-capacity-sprint$0.002Developer Utilities
Time Blocks per Day Calculator
Plan Focus Time After Breaks
POST /biz/time-blocks-per-day$0.002Developer Utilities
Timebox end time calculator
find a hard stop with buffer
POST /biz/timebox-end$0.002Developer Utilities
Two-minute rule task counter
count GTD quick wins and total time
POST /biz/two-minute-rule$0.002Developer Utilities
Age in years, months and days calculator
exact civil age from two dates
POST /date/age-months-days$0.002Developer Utilities
Age in Total Seconds Calculator
Seconds Lived
POST /date/age-total-seconds$0.002Developer Utilities
Which anniversary number calculator
work anniversary from hire date
POST /date/anniversary-number$0.002Developer Utilities
Project business days calculator
working days between start and end
POST /date/business-days-project$0.002Developer Utilities
Days until retirement age calculator
count days left to retire
POST /date/days-to-retirement$0.002Developer Utilities
Local time from UTC offset calculator
convert UTC to city time
POST /date/local-time-from-offset$0.002Developer Utilities
Next birthday countdown calculator
days until your birthday
POST /date/next-birthday-countdown$0.002Developer Utilities
Quarters elapsed in fiscal year calculator
elapsed and remaining
POST /date/quarters-elapsed$0.002Developer Utilities
Ship-by date calculator
latest working day to ship for delivery
POST /date/ship-by-date$0.002Developer Utilities
Weekends Until Date Calculator
Count Full Weekends
POST /date/weekends-until$0.002Developer Utilities
Working days in month calculator
Mon–Fri count with holidays
POST /date/working-days-this-month$0.002Developer Utilities
Years of service calculator
completed tenure from hire to reference date
POST /date/years-of-service$0.002Developer Utilities
Dry air density calculator
pressure and temperature to kg/m³
POST /earth/air-density-dry$0.002Developer Utilities
Air density ratio to sea level calculator from pressure and temperature
POST /earth/air-density-ratio$0.002Developer Utilities
Surface Albedo Reflected Radiation Calculator
POST /earth/albedo-reflected-radiation$0.002Developer Utilities
Air quality index from carbon monoxide
EPA AQI CO calculator
POST /earth/aqi-co$0.002Developer Utilities
Gutenberg-Richter b Value Calculator
POST /earth/b-value-gutenberg-richter$0.002Developer Utilities
Betz Limit Maximum Wind Power Calculator
POST /earth/betz-limit-power$0.002Developer Utilities
Flight carbon footprint calculator
CO₂e per passenger from distance
POST /earth/carbon-footprint-flight$0.002Developer Utilities
Climate Running Mean Smoother Calculator
POST /earth/climate-moving-average$0.002Developer Utilities
CO2 Offset Tree Equivalent Calculator
Trees Needed per Year
POST /earth/co2-tree-equivalent$0.002Developer Utilities
Coriolis parameter calculator
f = 2Ω sin(φ) from latitude
POST /earth/coriolis-parameter$0.002Developer Utilities
Effective growing degree days calculator
GDD with upper cutoff
POST /earth/degree-days-effective$0.002Developer Utilities
Density altitude from pressure altitude and temperature calculator
POST /earth/density-altitude-from-pressure$0.002Developer Utilities
Sonntag 1990 dew point calculator from temperature and humidity
POST /earth/dew-point-sonntag$0.002Developer Utilities
Diurnal temperature range calculator
daily max minus min average
POST /earth/diurnal-temperature-range$0.002Developer Utilities
Equivalent potential temperature calculator
Bolton θe
POST /earth/equivalent-potential-temperature$0.002Developer Utilities
Blaney-Criddle evapotranspiration calculator
estimate reference ET
POST /earth/evapotranspiration-blaney-criddle$0.002Developer Utilities
Hargreaves-Samani ET0 calculator
reference evapotranspiration
POST /earth/evapotranspiration-hargreaves$0.002Developer Utilities
Ship Froude number calculator
hull speed and wave resistance
POST /earth/froude-wave-ship$0.002Developer Utilities
Geopotential to Geometric Height Calculator
POST /earth/geopotential-to-geometric-height$0.002Developer Utilities
Greywater Reuse Water Savings Calculator
POST /earth/greywater-reuse-savings$0.002Developer Utilities
Growing degree days calculator
single-day averaging method
POST /earth/growing-degree-days$0.002Developer Utilities
Growing Season Length Calculator from Daily Frost Data
POST /earth/growing-season-length$0.002Developer Utilities
Simplified heat index calculator
Steadman approximation
POST /earth/heat-index-simple$0.002Developer Utilities
Steadman apparent temperature calculator with wind and radiation
POST /earth/heat-index-steadman$0.002Developer Utilities
Heat Pump Output from COP Calculator
POST /earth/heat-pump-cop-output$0.002Developer Utilities
Hydraulic conductivity from permeability calculator
POST /earth/hydraulic-conductivity$0.002Developer Utilities
Hydraulic Radius of Channel Calculator
Area ÷ Wetted Perimeter
POST /earth/hydraulic-radius$0.002Developer Utilities
Solar inverter sizing calculator
convert array watts to AC rating
POST /earth/inverter-sizing$0.002Developer Utilities
Koppen Climate Classification Calculator
POST /earth/koppen-classification$0.002Developer Utilities
Landfill methane generation calculator
first-order decay model
POST /earth/landfill-methane$0.002Developer Utilities
Lifting condensation level temperature calculator
Bolton relation
POST /earth/lcl-temperature$0.002Developer Utilities
Longshore sediment transport rate calculator
CERC formula
POST /earth/longshore-transport$0.002Developer Utilities
Earthquake energy ratio between magnitudes calculator
POST /earth/magnitude-energy-ratio$0.002Developer Utilities
Manning Open-Channel Discharge Calculator
POST /earth/manning-discharge$0.002Developer Utilities
Atmospheric moisture flux calculator
q × wind for water vapor transport
POST /earth/moisture-flux$0.002Developer Utilities
Annual pluviometric index calculator
compare rainfall with the mean
POST /earth/pluviometric-index$0.002Developer Utilities
Radiometric age calculator
age from parent/daughter ratio and λ
POST /earth/radiometric-age-general$0.002