BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at rest — with the Mifflin-St Jeor equation. Free, metric and imperial.
| Formula | Mifflin-St Jeor |
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BMR is the energy your body burns at complete rest to keep you alive. Multiply it by an activity factor to get your daily calorie needs (see the TDEE calculator).
⚕️ This is an educational estimate, not medical advice. Formulas are population averages and can't account for your full health picture — talk to a doctor or registered dietitian before making decisions about diet, weight or training.
How this calculator works
Basal Metabolic Rate is the energy your body uses at complete rest. The Mifflin-St Jeor equation — the most accurate of the common formulas — is 10 × weight(kg) + 6.25 × height(cm) − 5 × age, then + 5 for men or − 161 for women.
BMR is only part of the picture — digestion and daily movement burn more on top of it. Multiply BMR by an activity factor (see the TDEE calculator) to estimate what you actually need to eat.