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BMR Calculator (Basal Metabolic Rate)

Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation to find how many calories your body burns at rest.

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This is the number of calories your body burns at complete rest. Multiply by an activity factor to estimate your Total Daily Energy Expenditure (TDEE).

This is an estimate for informational purposes only and is not medical advice. Consult a healthcare provider.

How to Calculate & Formula Details

Mathematical Model FormulaMen: BMR = 10 x weight(kg) + 6.25 x height(cm) - 5 x age + 5. Women: BMR = 10 x weight(kg) + 6.25 x height(cm) - 5 x age - 161.

Your Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic life functions - breathing, circulation, and cell production - while completely at rest. It does not include any calories burned through movement or digestion.

The Mifflin-St Jeor Equation

This calculator uses the Mifflin-St Jeor equation, widely considered the most accurate BMR formula for most adults. It factors in weight, height, age, and biological sex.

BMR vs. TDEE

BMR only measures calories burned at complete rest. Total Daily Energy Expenditure (TDEE) multiplies BMR by an activity factor to estimate your true daily calorie needs for weight maintenance, loss, or gain.

Frequently Asked Questions

What is the difference between BMR and TDEE?

BMR is the calories your body burns at total rest. TDEE adds in calories burned through daily activity and exercise, and is the number most people should use for calorie planning.

Which BMR formula is most accurate?

The Mifflin-St Jeor equation, used here, is generally considered more accurate than the older Harris-Benedict formula for most modern populations.

Can I use my BMR to lose weight?

BMR alone is not enough for weight loss planning. Use it as an input to a TDEE calculation, then create a moderate calorie deficit from your TDEE.

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