Which formula should I use?

Mifflin-St Jeor is a common general estimate. Katch-McArdle uses body-fat percentage when a reliable measurement is available.

Is BMR the same as daily calorie needs?

No. Daily maintenance needs are higher because they include movement, work, exercise, and digestion.

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BMR Calculator

Compare resting energy with activity-adjusted maintenance needs using the formula that best matches your available measurements.

Last updated: August 29, 2026

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Health information notice

Health calculator outputs are informational and should not be treated as diagnosis or treatment guidance.

If the result could affect medication, nutrition, exercise intensity, or care decisions, validate it with a qualified professional.

Interactive tool

The live form, validation, and result state for BMR Calculator load after the page scripts run. The content below summarizes how the tool works and links to related pages in the catalog.

Estimate basal metabolic rate with Mifflin-St Jeor, revised Harris-Benedict, or Katch-McArdle formulas and compare maintenance energy.

bmr calculatorbasal metabolic rateresting caloriesmifflin st jeorkatch mcardle

How to use BMR Calculator

1
Enter your inputs into the BMR Calculator form.
2
Adjust optional settings so the scenario matches your real-world case.
3
Review the result, then tweak one variable at a time to compare outcomes.
4
Keep your best scenario as a baseline for future decisions.

Health and pregnancy tools are informational only. For diagnosis or treatment, rely on licensed clinical guidance.

Best use cases

Quickly evaluate bmr calculator decisions without switching tools.

Create quick estimates to support day-to-day nutrition or fitness planning.

Track how changes in activity, intake, or body metrics affect your targets.

Run side-by-side scenarios to choose a more realistic pace toward your goal.

How it works

Estimate basal metabolic rate with Mifflin-St Jeor, revised Harris-Benedict, or Katch-McArdle formulas and compare maintenance energy.

bmr calculatorbasal metabolic rateresting caloriesmifflin st jeorkatch mcardle

FAQ

Basal metabolic rate estimates the energy your body uses at complete rest for essential functions.

Tips for better results

Enter current values as accurately as possible for better estimates.
Recalculate regularly as your body metrics and activity change.
Use outputs as educational guidance, not a clinical diagnosis.

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