Calculator Guide

Health & Fitness

Body-composition and fitness metrics, written as functions with comma-separated arguments.

bmi(70, 1.75)
bmr male(80, 180, 30)
calories burned(8, 70, 30)
target heart rate(30, 70%)

Argument conventions

Units are accepted and converted. Weights take kg or pound; heights take m, cm, feet, or inch.
A bare number is metric — kilograms for weight, metres for height in BMI, and centimetres for height in BMR and ideal weight.
Sex-specific formulas are split into … male / … female functions.

Formula standards: BMR is Mifflin–St Jeor, body fat is Deurenberg (from BMI), and ideal weight is Devine.

Function	Description	Example
`bmi(weight, height)`	Body Mass Index, weight(kg)/height(m)²	`bmi(70, 1.75)`
`body fat male(w, h, age)`	Body fat % (Deurenberg)	`body fat male(80, 1.8, 30)`
`body fat female(w, h, age)`	Body fat % (Deurenberg)	`body fat female(65, 1.68, 28)`
`ideal weight male(height)`	Ideal body weight, kg (Devine)	`ideal weight male(180 cm)`
`ideal weight female(height)`	Ideal body weight, kg (Devine)	`ideal weight female(165 cm)`

bmi(70 kg, 1.75 meter)
bmi(154 pound, 5.9 feet)
body fat male(80, 1.8, 30)
ideal weight male(180 cm)

Function	Description	Example
`bmr male(w, h, age)`	Basal metabolic rate, kcal/day	`bmr male(80, 180, 30)`
`bmr female(w, h, age)`	Basal metabolic rate, kcal/day	`bmr female(65, 168, 28)`
`tdee(bmr, activityFactor)`	Total daily energy expenditure	`tdee(1780, 1.55)`
`calories burned(met, weight, minutes)`	Calories for an activity	`calories burned(8, 70, 30)`

Activity factors for tdee: 1.2 sedentary, 1.375 light, 1.55 moderate, 1.725 very active, 1.9 athlete.

bmr male(80, 180, 30)
tdee(1780, 1.55)
calories burned(8, 70, 30)

Function	Description	Example
`max heart rate(age)`	Maximum heart rate, bpm (220 − age)	`max heart rate(30)`
`target heart rate(age, intensity)`	Target heart-rate zone, bpm	`target heart rate(30, 70%)`
`water intake(weight)`	Suggested daily water (~33 ml/kg)	`water intake(70 kg)`

max heart rate(30)
target heart rate(30, 70%)
water intake(70 kg)

bmr(80, 180, 30) errors — there is no unisex bmr. Pick bmr male(...) or bmr female(...).
bmi(154, 5.9) for a 154 lb, 5'9" person returns 4.4 — the bare numbers are read as 154 kg and 5.9 m. Use bmi(154 pound, 5.9 feet).
Intensity in target heart rate is a percentage: write 70 or 70%.

These are population-formula estimates, not medical advice.