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BMR Calculator

Estimate calories your body uses at rest.

Your BMR is the calories your body burns at complete rest. It's estimated with Mifflin-St Jeor and is not the same as your daily calorie target.

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How this calculator works

Mifflin-St Jeor uses weight, height, age, and sex.

How to use your result

Keep your inputs consistent and compare weekly trends. Make small changes only after enough data accumulates.

Important limitation

Calculator results are estimates. Pregnancy, eating disorders, medical conditions, injuries, or concerning symptoms require qualified professional guidance.

Methodology sources

Frequently asked questions

What's the difference between BMR and TDEE?

BMR is resting energy only. TDEE multiplies BMR by your activity level and is what you'd actually eat to maintain weight.

Turn these numbers into a plan

RizzFit builds your workouts, calories, and macros around your goal — and adapts as you progress.

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