This basal metabolic rate calculator (BMR) finds your rate — the calories your body burns at rest — using the Mifflin-St Jeor equation. Enter your age, sex, height, and weight above.
Formula (Mifflin-St Jeor)
Men: BMR = 10×W + 6.25×H − 5×age + 5 Women: BMR = 10×W + 6.25×H − 5×age − 161
- W — weight (kg), H — height (cm)
Example
Man, 80 kg, 180 cm, 30 years: BMR = 1,780 kcal/day. Multiply by an activity factor for total daily needs.
Important
This tool is for general educational purposes only and is not medical advice, diagnosis, or treatment. It does not replace evaluation by a qualified healthcare professional — consult one for any health decision. Last updated: August 2026.
Frequently Asked Questions
What is basal metabolic rate?
The calories your body needs at complete rest to keep basic functions like breathing and circulation running.
How do I calculate BMR?
Use the Mifflin-St Jeor equation with your weight, height, age, and sex; it is today’s most accurate common estimate.
How do I get total daily calories from BMR?
Multiply BMR by an activity factor, from about 1.2 for sedentary to 1.9 for very active.