BMR Calculator
Calculate your Basal Metabolic Rate — the number of calories your body needs at rest. Compare results from multiple scientifically validated formulas.
How to Use
- Select your gender.
- Enter your age, height (cm), and weight (kg).
- Click “Calculate BMR” to see results from multiple formulas.
- Use your BMR with an activity multiplier to estimate daily calorie needs (TDEE).
Frequently Asked Questions
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest — just to keep your organs functioning, breathing, and maintaining body temperature. It typically accounts for 60-75% of total daily calorie expenditure.
Which BMR formula is most accurate?
The Mifflin-St Jeor equation is considered the most accurate for most people. It was developed in 1990 and has been validated in numerous studies.
How do I calculate TDEE from BMR?
Multiply your BMR by an activity factor: Sedentary (×1.2), Light exercise (×1.375), Moderate (×1.55), Very active (×1.725), Extra active (×1.9).
Does BMR change with age?
Yes, BMR typically decreases with age due to loss of muscle mass. Maintaining muscle through exercise can help keep your BMR higher as you age.