BMR Calculator
Basal metabolic rate
Calories your body burns at complete rest. Add an activity multiplier to get your daily target — see TDEE calculator.
About BMR Calculator
A BMR (basal metabolic rate) calculator estimates how many calories your body burns at complete rest — fuelling breathing, circulation, brain activity, and cell maintenance. It's the floor below which weight loss becomes unhealthy and the starting point for TDEE estimates.
Frequently asked questions
BMR is at rest. TDEE multiplies BMR by an activity factor to estimate total daily burn. Use TDEE for meal planning; BMR for understanding your baseline.
Mifflin-St Jeor is the modern default (most accurate for healthy adults). Older formulas (Harris-Benedict) overestimate by 5-10%.
Yes — drops ~2% per decade after 20 due to muscle-mass loss and metabolic slowdown.
Building muscle raises BMR (muscle tissue burns ~13 cal/kg/day at rest vs fat at ~4). Crash diets lower BMR — your body adapts to lower intake by burning less.
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