BMR Calculator
Calculate your Basal Metabolic Rate using multiple scientific formulas
About BMR Formulas
Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions at rest.
Mifflin-St Jeor Equation (1990)
Considered the most accurate for the general population.
Male: BMR = 10 × W + 6.25 × H - 5 × A + 5
Female: BMR = 10 × W + 6.25 × H - 5 × A - 161
Harris-Benedict Equation (1919)
Male: BMR = 66.47 + 13.75 × W + 5.003 × H - 6.755 × A
Female: BMR = 655.1 + 9.563 × W + 1.85 × H - 4.676 × A
Katch-McArdle Formula
Based on lean body mass: BMR = 370 + 21.6 × LBM (kg)
LBM = Weight × (1 - Body Fat % / 100)
Activity Multipliers
| Activity Level | Multiplier |
|---|---|
| Sedentary | 1.2 |
| Lightly Active | 1.375 |
| Moderately Active | 1.55 |
| Very Active | 1.725 |
| Extra Active | 1.9 |
W = Weight (kg), H = Height (cm), A = Age (years)
About this Calculator
The BMR Calculator is a free, easy-to-use tool for basal metabolic, calories, resting. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.
Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.