BMR Calculator

Estimate your Basal Metabolic Rate with the Mifflin-St Jeor equation.

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About the BMR Calculator

Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest to keep you alive: breathing, circulation and body temperature. It is the starting point for any calorie plan.

Formula (Mifflin-St Jeor)

  • Men: 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
  • Women: 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

This equation is considered one of the most accurate for most adults. To find your total daily needs including activity, use the TDEE Calculator.

How to use BMR Calculator

  1. Enter your values. Units and defaults are shown beside each field.
  2. Press Calculate (results also update as you type once calculated).
  3. Read the result and the step-by-step breakdown with the formula used.
  4. Copy the result or reset to start again.

Frequently asked questions

How accurate is this calculator?

Calculations use the standard formulas shown on the page, computed in full precision and rounded only for display. The result is only as accurate as the inputs and assumptions listed.

Is this medical advice?

No. Health calculators give general estimates for information only and are not a diagnosis. Speak to a qualified health professional about your situation.

Is it free?

Yes. All tools are free to use without an account.