BMR Calculator
BMR calculator using the Mifflin-St Jeor equation. Enter age, sex, height and weight to find the calories your body burns at rest each day.
Formula
BMR = 10·kg + 6.25·cm − 5·age + s (s = +5 male, −161 female)
Use it from the API
curl "https://moltcalc.com/api/calc/bmr?units=metric&sex=male&age=30&weight=70&height=175"
See the API docs for every endpoint and the input schema.
FAQ
What is BMR?+
Basal metabolic rate is the number of calories your body burns at complete rest just to keep you alive: breathing, circulation, cell repair and so on. It typically accounts for the largest share of the calories you burn in a day.
How is BMR calculated?+
This calculator uses the Mifflin-St Jeor equation: 10 × weight in kg + 6.25 × height in cm minus 5 × age, then plus 5 for men or minus 161 for women. It is widely regarded as one of the most accurate simple BMR formulas.
What is the difference between BMR and TDEE?+
BMR is calories burned at rest; TDEE (total daily energy expenditure) multiplies BMR by an activity factor to include movement and exercise. Use TDEE, not BMR, when setting a daily calorie target.