Health calculator

BMR Calculator by Age and Sex

Estimate basal metabolic rate from age, sex, height, and weight with the Mifflin-St Jeor equation.

FormulaMen: 10w + 6.25h - 5a + 5; Women: 10w + 6.25h - 5a - 161

Formula

BMR formula

BMR is an estimate of resting energy use. It is not a medical test.

Men: 10w + 6.25h - 5a + 5; Women: 10w + 6.25h - 5a - 161

A 30-year-old man at 80 kg and 180 cm has BMR = 10x80 + 6.25x180 - 5x30 + 5 = 1,780.

SourcesThis calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.

Sources and assumptions

Source notes

This calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.

Effective year
Current rules
Last verified
2026-06-18

BMR is an estimate of resting energy use. It is not a medical test.

Official and reference sources

Assumptions

  • The Mifflin-St Jeor male or female constant is selected from the sex input.

Not included

  • Measured resting energy expenditure, pregnancy, growth, illness, medication effects, and individualized clinical nutrition.
FAQ6 common questions for this calculator.

FAQs

Is BMR the same as daily calories?+

No. BMR estimates resting energy use; daily calories also depend on activity.

Which formula does this use?+

It uses the Mifflin-St Jeor equation, a common modern estimate for adults.

How does the BMR Calculator calculate the result?+

For the BMR Calculator, it uses the BMR formula: Men: 10w + 6.25h - 5a + 5; Women: 10w + 6.25h - 5a - 161. A 30-year-old man at 80 kg and 180 cm has BMR = 10x80 + 6.25x180 - 5x30 + 5 = 1,780.

What information do I need to use the BMR Calculator?+

For the BMR Calculator, enter age, sex, height, and weight. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

How accurate is the BMR Calculator?+

BMR Calculator is only as accurate as the age, sex, height, and weight entered. It applies the BMR formula shown on this page, then rounds for readability. Treat the output as screening guidance rather than a diagnosis.

What should I check before using the BMR Calculator result?+

For the BMR Calculator, check age, sex, height, and weight, unit choices, and whether the calculator's assumptions fit the person being assessed. Use the result as screening or planning context, not as a diagnosis.

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Health guide

How to use the BMR Calculator

Estimate basal metabolic rate from age, sex, height, and weight with the Mifflin-St Jeor equation. The page also explains the BMR formula and shows a practical example: A 30-year-old man at 80 kg and 180 cm has BMR = 10x80 + 6.25x180 - 5x30 + 5 = 1,780.

  1. 1

    Enter your details

    Enter age, sex, height, and weight, then complete any other fields shown in the calculator.

  2. 2

    Check the calculation

    Review the result alongside the BMR formula: Men: 10w + 6.25h - 5a + 5; Women: 10w + 6.25h - 5a - 161.

  3. 3

    Compare scenarios

    Change one or more inputs to see how they affect the BMR Calculator result before you use the estimate.