Health Calculators

BMI, BMR, TDEE, ideal weight, body surface area, waist ratios, lean body mass and healthy weight range.

Health
BMI Calculator
Body Mass Index from height and weight in metric or imperial units, with your category and healthy weight range.
BMI = weight (kg) ÷ height (m)²
Also called body mass index · bmi chart
Body Fat Ideal Weight Waist-to-Height Ratio
Health
BMR Calculator
Basal metabolic rate — calories burned at complete rest — using the Mifflin-St Jeor equation.
Mifflin-St Jeor: 10·kg + 6.25·cm − 5·age …
Also called basal metabolic rate · resting metabolism
TDEE Calorie Calories Burned
Health
TDEE Calculator
Total daily energy expenditure from BMR and activity level, with calorie targets for cutting and bulking.
TDEE = BMR × activity factor
Also called total daily energy expenditure · maintenance calories
BMR Calorie Calorie Deficit
Health
Ideal Weight Calculator
Ideal body weight by the Devine, Robinson, Miller and Hamwi formulas, plus the healthy BMI range for your height.
Devine: 50 kg (male) / 45.5 kg (female) +…
Also called ibw calculator · healthy weight for height
BMI Healthy Weight Range Body Fat
Health
Body Surface Area Calculator
Body surface area (BSA) by the Du Bois, Mosteller, Haycock and Gehan-George formulas — used for drug dosing.
Mosteller: √(height cm × weight kg ÷ 3600)
Also called bsa calculator · mosteller formula
BMI Lean Body Mass Waist-to-Height Ratio
Health
Waist-to-Height Ratio Calculator
Waist-to-height ratio (WHtR) — a simple screen for central obesity: keep your waist under half your height.
Waist-to-height ratio = Waist circumferen…
Also called whtr calculator · waist height ratio
Waist-to-Hip Ratio BMI Body Fat
Health
Waist-to-Hip Ratio Calculator
Waist-to-hip ratio (WHR) and your health-risk band by sex, an indicator of fat distribution.
WHR = waist ÷ hip circumference
Also called whr calculator · waist hip ratio
Waist-to-Height Ratio Body Fat BMI
Health
Lean Body Mass Calculator
Lean body mass (fat-free mass) by the Boer, James and Hume formulas, or from a known body-fat percentage.
Boer (male): 0.407·kg + 0.267·cm − 19.2
Also called lbm calculator · fat free mass
Body Fat Protein BMR
Health
Body Frame Size Calculator
Small, medium or large body frame from height and wrist circumference — used to adjust ideal weight ranges.
Ratio = height ÷ wrist circumference
Also called frame size calculator · wrist size frame
Ideal Weight BMI Healthy Weight Range
Health
Healthy Weight Range Calculator
The weight range for a healthy BMI (18.5–24.9) at your height, and how far your current weight is from it.
Healthy weight = BMI 18.5–24.9 × height (…
Also called weight range for height · normal weight range
BMI Ideal Weight Weight Goal

Key health formulas

BMI	BMI = weight (kg) ÷ height (m)²
BMR	Mifflin-St Jeor: 10·kg + 6.25·cm − 5·age + 5 (male) / − 161 (female)
TDEE	TDEE = BMR × activity factor
Ideal Weight	Devine: 50 kg (male) / 45.5 kg (female) + 2.3 kg per inch over 5 ft
Body Surface Area	Mosteller: √(height cm × weight kg ÷ 3600)
Waist-to-Height Ratio	Waist-to-height ratio = Waist circumference ÷ Height
Waist-to-Hip Ratio	WHR = waist ÷ hip circumference
Lean Body Mass	Boer (male): 0.407·kg + 0.267·cm − 19.2
Body Frame Size	Ratio = height ÷ wrist circumference
Healthy Weight Range	Healthy weight = BMI 18.5–24.9 × height (m)²

Health questions

What is a healthy BMI?

For adults, 18.5–24.9 is considered a healthy range, 25–29.9 overweight and 30+ obese. Children and teenagers use age- and sex-specific percentiles instead.

What is the difference between BMR and TDEE?

BMR is what your body burns at complete rest. TDEE multiplies BMR by an activity factor to include movement, exercise and digestion — that is the number to use for diet planning.