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BMR Calculator

Estimate basal metabolic rate using the Mifflin St Jeor equation and compare it with a second reference formula.

Enter your measurements and health details

Use current, consistently measured values for the bmr calculation. Results update automatically and are intended for education and planning, not diagnosis.

Sex used by equation

Age

Weight

Height

Mifflin St Jeor BMR—

Revised Harris Benedict reference—

Difference between equations—

Important: Health results are educational screening and planning estimates. They are not a diagnosis and are not a substitute for medical care.

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How to use this calculator

Using the calculator

Enter Sex used by equation, Age, Weight, Height. Estimate basal metabolic rate using the Mifflin St Jeor equation and compare it with a second reference formula.

Reading the result

The result estimates daily energy needs from the personal and activity information entered. Use it as a planning estimate rather than an exact measurement.

How it is calculated

BMR estimates resting energy use from variables such as age, sex, height, and weight using the equation identified on the calculator. It is a modeled baseline, not a direct metabolic measurement.

Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.

Common questions

Is BMR the same as calories burned in a day?

No. BMR estimates energy use at rest. Total daily energy expenditure adds an activity estimate and is normally higher than BMR.

Why is BMR only an estimate?

BMR equations use a small set of measurable variables to estimate a complex biological process. Individual metabolism can differ from the equation result.

Should I eat exactly my BMR?

A BMR result is not an individualized nutrition prescription. Food needs can depend on activity, goals, medical conditions and other factors.