BMR Calculator
Estimate Basal Metabolic Rate (BMR) using the Mifflin–St Jeor equation.
Inputs
Result
Enter values on the left and select Equals to see the result here.
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What the BMR Calculator does
- Estimates BMR—your body’s baseline daily energy use at rest.
- Provides a starting point for planning nutrition and activity goals.
How to use the BMR Calculator
- Enter your age, sex, height (cm), and weight (kg).
- Click Calculate to get your estimated BMR in kcal/day.
Formula / methodology used
- Uses the Mifflin–St Jeor equation, a commonly used BMR estimate.
- BMR is an estimate; it varies by body composition and measurement accuracy.
Example calculation
Female, 30 years, 165 cm, 65 kg.
- Enter age/sex/height/weight
- Calculate BMR
Result: Outputs BMR in kcal/day.
BMR Calculator FAQs
Is BMR the same as TDEE?
No. BMR is energy at rest. TDEE includes activity and is typically higher.
Why does sex affect BMR?
Equations include sex-based constants because average body composition differs across populations.