BMR Calculator (Basal Metabolic Rate)
Enter your weight, height, age and sex to calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation.
BMR Calculator (Basal Metabolic Rate)
Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at rest — using the Mifflin-St Jeor equation.
Basal Metabolic Rate (BMR) is the number of calories your body needs at complete rest just to maintain basic functions like breathing and circulation. The Mifflin-St Jeor equation, used here, is generally considered one of the more accurate predictive formulas for BMR in healthy adults.
Example
- With the default values shown above, this calculator returns: Basal Metabolic Rate (BMR) ≈ 1,618.
Frequently Asked Questions
What is BMR used for?
BMR is the starting point for estimating total daily calorie needs — it represents calories burned at rest, before adding activity. Multiplying BMR by an activity factor gives your Total Daily Energy Expenditure (TDEE).
Why does sex affect the result?
On average, men have more lean muscle mass relative to body weight than women, which raises resting energy needs — the Mifflin-St Jeor equation adjusts for this with a fixed offset.