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
Calories burned standing calculator
kcal from weight and time
POST /sports/calories-burned-standing$0.002Developer Utilities
Burpee calorie calculator
calories burned from weight, reps and time
POST /sports/burpee-calorie$0.002Developer Utilities
Cycling heart rate zones
bpm ranges from HRmax or LTHR
POST /sports/cycling-hr$0.002Developer Utilities
Cycling wattage calculator
watts from speed, weight, grade & drag
POST /sports/cycling-wattage$0.002Developer Utilities
Cycling training zones
FTP power and LTHR heart-rate bands, free
POST /sports/cycling-zones$0.002Developer Utilities
Earned run average calculator
ERA from earned runs and innings
POST /sports/earned-run-average$0.002Developer Utilities
Effective field goal % calculator
eFG% from FGM, 3PM and FGA
POST /sports/efg$0.002Developer Utilities
Elliptical calorie calculator
calories burned, free
POST /sports/elliptical-calorie$0.002Developer Utilities
Fat-burning zone calculator
target bpm from age and rest HR
POST /sports/fat-burning-zone$0.002Developer Utilities
Fish weight calculator
estimate from species, length and girth
POST /sports/fish-weight$0.002Developer Utilities
Arrow FOC calculator
front of center % from length and balance
POST /sports/foc$0.002Developer Utilities
Basketball game score calculator
Hollinger GmSc from box stats
POST /sports/game-score$0.002Developer Utilities
Heart rate calculator
estimated max HR from age in bpm
POST /sports/heart-rate$0.002Developer Utilities
Hiking calculator
time and calories from distance and gain
POST /sports/hiking$0.002Developer Utilities
ICC net run rate calculator
NRR from runs and overs
POST /sports/icc$0.002Developer Utilities
Lubricant cost to run
annual cost from price, rate and hours
POST /sports/lubricant-cost-to-run$0.002Developer Utilities
Magic mile calculator
predict 5K to marathon finish times
POST /sports/magic-mile$0.002Developer Utilities
Max heart rate
Tanaka 208 − 0.7×age for sports, bpm
POST /sports/max-heart-rate$0.002Developer Utilities
On-base plus slugging calculator
OPS from OBP and SLG
POST /sports/on-base-plus-slugging$0.002Developer Utilities
Pool table room size calculator
min length and width from table and cue
POST /sports/pool-table-room-size$0.002Developer Utilities
Race predictor
Riegel finish time from a known race
POST /sports/race-predictor$0.002Developer Utilities
Save percentage calculator
SV% from saves and shots
POST /sports/save-percentage$0.002Developer Utilities
Slugging percentage calculator
total bases over at-bats to 3 decimals
POST /sports/slugging-percentage$0.002Developer Utilities
Snow shoveling calories burned
kcal from weight, time and snow
POST /sports/snow-shoveling-calories-burned$0.002Developer Utilities
Steps to calories calculator
kcal from steps, weight, stride
POST /sports/steps-to-calories$0.002Developer Utilities
Steps to km calculator
convert steps to kilometers
POST /sports/steps-to-km$0.002Developer Utilities
Swimming time calculator
finish time from pace per 100m
POST /sports/swimming-time$0.002Developer Utilities
Training pace calculator
min/km from elapsed time and distance
POST /sports/training-pace$0.002Developer Utilities
Triathlon time calculator
swim, bike, run, T1 and T2
POST /sports/triathlon$0.002Developer Utilities
True shooting % calculator
TS% from points, FGA and FTA
POST /sports/ts$0.002Developer Utilities
Alcohol by volume calculator
ABV from OG and FG
POST /cook/alcohol-by-volume$0.002Developer Utilities
Alcohol dilution calculator
water to add from volume and ABV
POST /cook/alcohol-dilution$0.002Developer Utilities
BBQ party calculator
meat, sides and drinks from guest count
POST /cook/bbq-party$0.002Developer Utilities
Brine calculator
salt and sugar grams from water and salinity
POST /cook/brine$0.002Developer Utilities
Cake pans calculator
batter volume scale between two round pans
POST /cook/cake-pans$0.002Developer Utilities
VO2 max calculator for runners
Daniels race formula estimate
POST /sports/vo2-max-runners$0.002Developer Utilities
Weight loss calculator
weekly and daily calorie deficit
POST /sports/weight-loss$0.002Developer Utilities
Windsurfing sail size calculator
sail area from weight and wind
POST /sports/windsurfing$0.002Developer Utilities
Chocolate serving calculator
grams and bars from guests
POST /cook/chocolate$0.002Developer Utilities
Coffee kick calculator
hours until caffeine wears off
POST /cook/coffee-kick$0.002Developer Utilities
Coffee ratio calculator
grounds from water volume
POST /cook/coffee-ratio$0.002Developer Utilities
Cups to pounds converter
flour, sugar, butter by density, free
POST /cook/cups-to-pounds$0.002Developer Utilities
Donut calorie calculator
kcal and running time to burn
POST /cook/donut$0.002Developer Utilities
Egg boiling time calculator
minutes from size, temp and doneness
POST /cook/egg-boiling$0.002Developer Utilities
Grams to tsp converter
by ingredient density, free
POST /cook/grams-to-tsp$0.002Developer Utilities
Healthy coffee calorie calculator
type, milk and sugar
POST /cook/healthy-coffee$0.002Developer Utilities
Ice cream calculator
cream, milk and sugar from servings
POST /cook/ice-cream$0.002Developer Utilities
Oil to butter converter
recipe oil to grams of butter
POST /cook/oil-to-butter$0.002Developer Utilities
Pancake recipe scaler
scale ingredients by servings or pancakes
POST /cook/pancake-recipe$0.002Developer Utilities
Perfect pizza dough calculator
flour, water, salt and yeast grams
POST /cook/perfect-pizza$0.002Developer Utilities
Pizza party calculator
how many pizzas to order
POST /cook/pizza-party$0.002Developer Utilities
Popcorn yield calculator
popped volume from unpopped kernels
POST /cook/popcorn$0.002Developer Utilities
Quarantine food calculator
household servings for isolation days
POST /cook/quarantine-food$0.002Developer Utilities
Self-rising flour calculator
baking powder and salt from flour
POST /cook/self-rising-flour$0.002Developer Utilities
Steak cook time
pan or grill minutes per side by thickness
POST /cook/steak-cook-time$0.002Developer Utilities
Taco bar calculator
meat, shells and toppings from guests
POST /cook/taco-bar$0.002Developer Utilities
Thanksgiving calorie calculator
turkey, sides, dessert, drinks
POST /cook/thanksgiving-calories$0.002Developer Utilities
Turkey defrost time
refrigerator or cold water by weight
POST /cook/turkey-defrost$0.002Developer Utilities
Turkey thawing calculator
fridge days or cold-water hours
POST /cook/turkey-thawing$0.002Developer Utilities
Wedding alcohol calculator
beer, wine and liquor bottles
POST /cook/wedding-alcohol$0.002