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BMR and daily energy calculator

Your basal metabolic rate is roughly what your body uses at complete rest. Multiplying it by an activity factor gives an estimate of daily energy use.

Your details

Enter your details. Estimates of this kind are approximate.

The equation uses different constants; it has no other significance here.
In years. For adults only.

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BMI

Figures checked

Uses the Mifflin-St Jeor equation, the equation most commonly used in practice. This is general information, not dietary advice. This is general information, not professional advice.

The equation used

This calculator uses the Mifflin-St Jeor equation, which is the one most commonly used in practice and generally performs better than the older Harris-Benedict equation. For men it is ten times weight in kilograms, plus 6.25 times height in centimetres, minus five times age, plus five. For women the final term is minus 161 rather than plus five.

Activity factors

The multipliers are broad brush and people routinely overestimate their own activity. If a figure seems higher than expected, trying the level below is usually closer to the truth.

Accuracy

Any equation of this sort is an estimate built from population averages. It takes no account of body composition, which matters a great deal, since muscle uses more energy at rest than fat does. Treat the figure as a starting point rather than a target.