BMR Calculator

Calculate Basal Metabolic Rate

How to Use

Input your age, gender, height, and weight.

See your BMR calculated using multiple formulas.

Review Mifflin-St Jeor, Harris-Benedict, and other calculations.

Learn what your BMR means for daily calorie needs.

What is BMR?

Basal Metabolic Rate (BMR) is the calories your body burns at rest to maintain vital functions like breathing, circulation, and cell production.

Which formula is most accurate?

The Mifflin-St Jeor equation is considered most accurate for most people. Harris-Benedict may be better for very active individuals.

Why do I need to know my BMR?

BMR is the foundation for calculating your daily calorie needs. Add activity calories to BMR to get your TDEE for weight management.

Does age affect BMR?

Yes, BMR typically decreases with age as muscle mass declines. This is why the formulas include age as a factor.