Before calculating
Prepare Sex used by the equation, Age, Height, Additional height and Weight. Match each input to the document, measurement, or current source you are using. Keep units, dates, currency, and time periods consistent.
HEALTH REFERENCES WITH CLEAR LIMITS
BMR Calculator
Estimate basal metabolic rate from adult age, sex, height, and weight using the Mifflin–St Jeor equation.
Review your result
Your result
Ready when you are.
Enter your values and select Calculate. Your result stays on this device.
How it works
Mifflin–St Jeor: 10 × kg + 6.25 × cm − 5 × age + s, where s is 5 for male and −161 for female.
Assumptions
Adult estimate only; measured metabolism can differ.
Use case
BMR calculator: a clear planning check
Estimate basal metabolic rate from adult age, sex, height, and weight using the Mifflin–St Jeor equation. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context.
Use a clear BMR calculator scenario with values you can verify before relying on the result.
Build a reliable scenario
How to use and verify your BMR Calculator result
BMR Calculator helps you check a specific health & family question with figures that apply to you. Estimate basal metabolic rate from adult age, sex, height, and weight using the Mifflin–St Jeor equation. Estimate basal metabolic rate from adult age, sex, height, and weight using the Mifflin–St Jeor equation. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context. Use a clear BMR calculator scenario with values you can verify before relying on the result. The page keeps the method and limits visible so the result can be understood, compared, and checked instead of treated as an unexplained answer.
What changes the result?
The stated method is: Mifflin–St Jeor: 10 × kg + 6.25 × cm − 5 × age + s, where s is 5 for male and −161 for female. Change one assumption at a time to see which input drives the result, then compare scenarios on the same basis.
When checking the answer
Adult estimate only; measured metabolism can differ. Not medical or nutrition advice. Do not use alone for clinical or eating-disorder decisions.
Quick verification checklist
- • Confirm the date and unit of every input.
- • Replace defaults with values that match your case.
- • Compare the answer with a second scenario.
- • Use the official source for regulated or high-impact decisions.
Method and update
Last reviewed: 2026-08-08. This tool performs the stated formula locally in your browser using the values you enter.
Frequently asked questions
Is BMR Calculator free to use?
Yes. This calculator runs in your browser and does not require an account.
Is the result guaranteed?
Adult estimate only; measured metabolism can differ.
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