BMR Calculator
See how many calories your body burns at complete rest — your basal metabolic rate — using the Mifflin-St Jeor equation.
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What BMR tells you
Your basal metabolic rate is the energy your body spends just staying alive — heartbeat, breathing, brain, temperature — before you lift a finger. It typically accounts for 60–70% of everything you burn in a day, which is why two people the same size can have such different calorie needs once activity is added. This calculator uses the Mifflin-St Jeor equation, generally the most accurate formula for the general population. Never eat below your BMR for long stretches without professional supervision — it's a floor, not a target.