BMR Calculator

Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production. This calculator compares three established BMR formulas to give you a comprehensive picture of your resting metabolism, which forms the foundation for all calorie and nutrition planning.

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Enables the Katch-McArdle formula for a more accurate estimate

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Frequently Asked Questions

What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest to maintain vital functions — breathing, heart beating, brain function, cell repair. BMR typically accounts for 60-75% of total daily calorie expenditure.
What is the difference between BMR and TDEE?
BMR is calories burned at rest; TDEE (Total Daily Energy Expenditure) includes BMR plus calories from physical activity and the thermic effect of food. TDEE = BMR × activity multiplier. TDEE is what you use for diet planning.
Which BMR formula is most accurate?
The Mifflin-St Jeor equation (1990) is considered most accurate for most people. Harris-Benedict (1919, revised 1984) is older but still widely used. Katch-McArdle uses lean body mass and is most accurate if you know your body fat percentage.
What affects BMR?
Key factors: muscle mass (more muscle = higher BMR), age (decreases ~2% per decade after 20), sex (men typically have higher BMR), genetics, thyroid function, body size, and extreme dieting (can lower BMR through metabolic adaptation).

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