Calorie Calculator

Basal metabolic rate: the energy your body uses at rest, for breathing, circulation and keeping warm. It is usually most of what you burn each day.

Mifflin-St Jeor (1990), which studies found the most accurate of the common equations for most adults. The result is multiplied by an activity factor from 1.2 to 1.9.

About 7,700 kcal per kilogram (3,500 per pound) of body weight, as a rough guide. Real weight change is slower as the body adapts, so treat the targets as a starting point.

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