BMR Calculator
Estimate calories burned at rest from age, sex, height, and weight. This page uses the Mifflin-St Jeor equation.
years
kg
cm
About this calculator
Basal metabolic rate is an estimate of calories burned at complete rest. The Mifflin-St Jeor equation is a widely used estimate for adults from age, sex, height, and weight.
Limits
- Mifflin-St Jeor estimates resting burn for adults. It is not a measured metabolic rate.
- Illness, medication, and body composition are not inputs.
- Not medical or diet advice.
How to calculate
Enter sex, age, height, and weight. The result is calories per day at rest. Multiply by an activity factor in the calorie calculator to estimate daily needs.
Men: 10W + 6.25H − 5A + 5
Women: 10W + 6.25H − 5A − 161
W in kg, H in cm, A in years
When to use it
- A starting point before a calorie or TDEE estimate
Examples
30-year-old woman, 65 kg, 165 cm
BMR ≈ 10×65 + 6.25×165 − 5×30 − 161 = 1,372 kcal/day.
Activity factors used with BMR on the calorie calculator
| Level | Factor |
|---|---|
| Sedentary | × 1.2 |
| Light (1–3 days/week) | × 1.375 |
| Moderate (3–5 days/week) | × 1.55 |
| Active (6–7 days/week) | × 1.725 |
| Very active | × 1.9 |
FAQ
Is BMR the same as TDEE?
No. BMR is rest only. TDEE multiplies BMR by an activity factor to estimate a typical day.
Why Mifflin-St Jeor?
It is a commonly used adult estimate and tends to be more accurate than older Harris-Benedict versions for many people.