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
Gift wrap paper calculator
estimate paper needed for a box
POST /final3/gift-wrap-paper-estimate$0.002Developer Utilities
Build Goal Milestone Progress Chart Data Points
POST /final3/goal-milestone-progress-chart-data$0.002Developer Utilities
Grocery budget per meal calculator with category targets
POST /final3/grocery-budget-per-meal$0.002Developer Utilities
Habit tracking streak calculator
current and longest streak
POST /final3/habit-streak-calculate$0.002Developer Utilities
Estimate monthly appliance energy cost from watts and daily use
POST /final3/home-energy-bill-estimate$0.002Developer Utilities
Check the minimum home workout space needed for your exercise
POST /final3/home-workout-space-check$0.002Developer Utilities
Intermittent Fasting Eating Window Calculator
POST /final3/intermittent-fasting-window-calc$0.002Developer Utilities
Estimate leftover portions for freezing from recipe yield
POST /final3/leftover-portion-freeze-estimate$0.002Developer Utilities
Moving truck size calculator
estimate the truck you need
POST /final3/moving-truck-size-estimate$0.002Developer Utilities
Calculate Party Supplies Quantity Needed
POST /final3/party-supply-quantity-calc$0.002Developer Utilities
Build a password rotation reminder schedule
POST /final3/password-change-reminder-schedule$0.002Developer Utilities
Build a recurring bills due date calendar
POST /final3/recurring-bill-due-date-list$0.002Developer Utilities
Running Shoe Mileage Calculator
Check Miles Remaining
POST /final3/running-shoe-mileage-tracker$0.002Developer Utilities
Average daily screen time calculator
find highest and lowest days
POST /final3/screen-time-daily-average$0.002Developer Utilities
Calculate optimal wake-up times by sleep cycle
POST /final3/sleep-cycle-wake-time-calc$0.002Developer Utilities
Daily step goal progress percentage calculator
steps remaining
POST /final3/step-goal-progress-percent$0.002Developer Utilities
Storage unit size recommendation for boxes and furniture
POST /final3/storage-unit-size-recommend$0.002Developer Utilities
Free trial end date and reminder date calculator
POST /final3/subscription-free-trial-end-date$0.002Developer Utilities
Calculate Multiple Warranty Expiration Dates and Upcoming Deadlines
POST /final3/warranty-expiration-tracker$0.002Developer Utilities
Daily water bottle refill calculator
bottles needed per day
POST /final3/water-bottle-daily-refill-count$0.002Developer Utilities
Estimate calories burned by activity MET, weight and duration
POST /fitness2/calories-burned-activity-met$0.002Developer Utilities
Determine your cardio training zone from heart rate
POST /fitness2/cardio-zone-from-hr$0.002Developer Utilities
Estimate sweat rate from a pre- and post-workout weigh-in
POST /fitness2/hydration-sweat-rate-estimate$0.002Developer Utilities
Progressive overload weight plan calculator
POST /fitness2/progressive-overload-plan$0.002Developer Utilities
Estimate distance from step count and stride length
POST /fitness2/step-count-distance-estimate$0.002Developer Utilities
Acute:chronic workload ratio calculator and risk zones
POST /fitness2/training-load-acute-chronic$0.002Developer Utilities
Copyright Notice Generator
Format a Copyright Line
POST /legal2/copyright-notice-generate$0.002Developer Utilities
Generate a demand letter structure template
POST /legal2/demand-letter-structure$0.002Developer Utilities
Generate an employee termination checklist by termination type
POST /legal2/employment-termination-checklist$0.002Developer Utilities
Generate a GDPR data subject request response checklist
POST /legal2/gdpr-dsar-response-checklist$0.002Developer Utilities
List independent contractor classification factors
POST /legal2/independent-contractor-test-factors$0.002Developer Utilities
Standard resolutions for an aspect ratio
quick lookup
POST /misc2/aspect-ratio-resolution-lookup$0.002Developer Utilities
Estimate device battery life from battery capacity and current draw
POST /misc2/battery-life-estimate$0.002Developer Utilities
Convert bra size between US, UK and EU regions
POST /misc2/bra-size-convert$0.002Developer Utilities
Parse chess time control notation and calculate game duration
POST /misc2/chess-clock-time-control$0.002Developer Utilities
Determine Chinese zodiac from year
animal and element calculator
POST /misc2/chinese-zodiac-from-year$0.002Developer Utilities
Convert clothing sizes between US, UK and EU regions
POST /misc2/clothing-size-convert$0.002Developer Utilities
Convert data storage units
bytes, KB, MB, GB, TB, and binary units
POST /misc2/data-storage-unit-convert$0.002Developer Utilities
Convert fuel efficiency units
MPG, L/100km and km/L
POST /misc2/fuel-efficiency-convert$0.002Developer Utilities
Look up a generation cohort from a birth year
POST /misc2/generation-cohort-lookup$0.002Developer Utilities
Estimate file download time from size and connection speed
POST /misc2/internet-download-time-estimate$0.002Developer Utilities
Knitting gauge adjustment calculator
convert pattern stitch counts
POST /misc2/knitting-gauge-convert$0.002Developer Utilities
Estimate the moon phase for any calendar date
POST /misc2/moon-phase-estimate$0.002Developer Utilities
Calculate name numerology value
Pythagorean name number
POST /misc2/name-numerology-value$0.002Developer Utilities
Calculate your numerology life path number from a birth date
POST /misc2/numerology-life-path-number$0.002Developer Utilities
Oil change due mileage calculator
estimate distance remaining
POST /misc2/oil-change-interval-estimate$0.002Developer Utilities
Required print DPI calculator
pixels and print size
POST /misc2/print-resolution-dpi-calc$0.002Developer Utilities
Convert ring size between regions
US, UK and EU sizes
POST /misc2/ring-size-convert$0.002Developer Utilities
Convert a date to Roman numeral format for tattoos and engravings
POST /misc2/roman-numeral-date-convert$0.002Developer Utilities
Calculate screen diagonal from dimensions
width, height, and aspect ratio
POST /misc2/screen-size-diagonal-calc$0.002Developer Utilities
Subnet usable host calculator
total addresses from CIDR or mask
POST /misc2/subnet-host-count$0.002Developer Utilities
Convert tire pressure units between PSI, bar, and kPa
POST /misc2/tire-pressure-convert$0.002Developer Utilities
Decode tire size notation
understand width, ratio, construction and rim
POST /misc2/tire-size-decode$0.002Developer Utilities
Validate a VIN check digit
free 17-character VIN checker
POST /misc2/vin-check-digit-validate$0.002Developer Utilities
Check WiFi channel overlap for 2.4 GHz channels
POST /misc2/wifi-channel-overlap-check$0.002Developer Utilities
Determine zodiac sign from birthdate
month and day lookup
POST /misc2/zodiac-sign-from-date$0.002Developer Utilities
College fund progress percentage calculator
POST /parent/college-fund-progress-percent$0.002Developer Utilities
Determine diaper size by weight
POST /parent/diaper-size-by-weight$0.002Developer Utilities
Seeded screen-free activity picker for kids by age
POST /parent/screen-free-activity-pick-seeded$0.002Developer Utilities
Calculate total mortgage interest paid over the full loan term
POST /realestate/amortization-total-interest$0.002