BMR Calculator
Calculate your Basal Metabolic Rate — the number of calories your body burns at rest. Compare results from three scientific formulas.
Frequently Asked Questions
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic life functions while at complete rest — breathing, circulation, cell production, and temperature regulation. It accounts for about 60-75% of total daily calorie expenditure.
What is the difference between BMR and TDEE?
BMR is the calories burned at rest. TDEE (Total Daily Energy Expenditure) includes BMR plus calories burned through physical activity and digesting food. TDEE = BMR × Activity Factor.
Which BMR formula is most accurate?
The Mifflin-St Jeor equation is considered the most accurate for most people (within 10% of measured BMR). The Katch-McArdle formula is best if you know your body fat percentage, as it accounts for lean body mass.