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BMR Calculator

A BMR (Basal Metabolic Rate) calculator estimates the minimum calories your body needs at rest.

Calculate your Basal Metabolic Rate — the number of calories your body needs at complete rest.

Your Basal Metabolic Rate
calories/day
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Mifflin-St Jeor Equation

Men: BMR = 10×weight(kg) + 6.25×height(cm) - 5×age(y) - 5 Women: BMR = 10×weight(kg) + 6.25×height(cm) - 5×age(y) - 161

The Mifflin-St Jeor equation (1990) is considered the most accurate formula for estimating BMR. It predicts within 10% of actual values for most people.

BMR represents the minimum calories needed to maintain vital functions (breathing, circulation, cell production) while at complete rest.

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Frequently Asked Questions

How does the BMR Calculator work?

The BMR Calculator uses standard formulas to calculate your results. Enter your values in the input fields and click Calculate to see instant results.

Is the BMR Calculator free?

Yes, the BMR Calculator on CalcMaster is completely free to use with no signup required. Your data stays in your browser and is never sent to any server.

How accurate is the BMR Calculator?

The BMR Calculator uses verified formulas and provides accurate estimates for informational purposes. Results are calculated instantly in your browser.