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BMR Calculator

Estimate resting energy needs with common predictive equations. Use it as a planning estimate, not a medical measurement.

Predictive equations can be wrong for individuals, especially with unusual body composition, illness, pregnancy, heavy training or weight change.

How the estimate is calculated

Mifflin-St Jeor estimates resting energy expenditure from weight, height, age and sex. Revised Harris-Benedict is shown as a comparison because different calculators and clinicians may use different equations.

Example

For a 35-year-old male at 175 cm and 75 kg, Mifflin-St Jeor estimates about 1,674 kcal/day before activity is added.

Common mistakes

Do not use BMR as a daily calorie target unless a clinician specifically recommends it. Most people need TDEE, which adds activity to BMR.

How to interpret BMR

BMR is not a diagnosis, meal plan or metabolic test. It is a baseline estimate before activity is added. Indirect calorimetry and clinical review are needed when precision matters.

References

Last reviewed: 2026-05-17

Before relying on this result

Use this calculator together with the formula, assumptions, limitations and examples on the page. If the topic involves health, tax, lending, investment, legal, safety or current-rate decisions, treat the number as an estimate and check the relevant primary source or professional guidance.

Calculator metadata last reviewed: 2026-05-14.