FREE ONLINE TOOL · FITNESS & HEALTH CALCULATORS

BMR Calculator

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

Instant resultsFree to useNo account required
Calculator inputs

Enter your values to calculate an estimate.

Results update as you change inputs. Check the assumptions and formula below before using an estimate for a financial, health or academic decision.

Your results

Calculated from the values entered.

Estimate

Estimated basal metabolic rate

1,698.75kcal/day

Calculations run in your browser. Values are not sent to FastSEOHub.

What is a bmr?

Basal metabolic rate (BMR) estimates the energy the body uses at rest to support essential functions. This calculator uses the Mifflin–St Jeor equation. It is an equation-based estimate rather than a direct measurement and does not include activity calories.

Formula and calculation method

Men: BMR = 10W + 6.25H − 5A + 5. Women: BMR = 10W + 6.25H − 5A − 161, where W is kg, H is cm and A is years.

The result is only as reliable as the inputs and assumptions. This tool is educational and does not replace professional financial, medical, legal or academic advice.

How to use this calculator

  1. Enter the values requested in the calculator.
  2. Review the result panel; it updates when an input changes.
  3. Change one assumption at a time to compare scenarios.
  4. Check the formula and limitations before acting on the estimate.

Frequently asked questions

Is this bmr calculator free?

Yes. You can use this calculator in your browser without creating an account.

How accurate is the result?

It applies the displayed formula to the values you provide. Real-world outcomes can differ because of fees, changing rates, individual circumstances or rules not represented in this estimate.

Are my inputs stored?

No. The calculation runs locally in your browser and the values are not submitted to FastSEOHub.

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