BMR Calculator
Estimate your Basal Metabolic Rate (BMR) — the calories your body burns at rest — using the Mifflin–St Jeor equation. Supports Imperial and Metric units.
BMR (Calories/day)
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About the BMR Calculator
The BMR Calculator estimates your Basal Metabolic Rate — the amount of energy your body needs each day to maintain essential functions such as breathing, blood circulation, nutrient processing, and cellular repair.
How the BMR Formula Works
CalculatorFox uses the Mifflin–St Jeor Equation, the modern gold-standard formula preferred by nutritionists because it is more accurate than older formulas like Harris–Benedict.
- Men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
- Women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
Example Calculation
BMR ≈ 1,688 calories/day
What Affects Your BMR?
- Age, gender, muscle mass, genetics
- Larger bodies burn more calories
BMR vs. TDEE
TDEE = BMR × Activity Level
How to Use BMR for Weight Goals
- Weight Loss: Eat 10–20% below TDEE
- Gain: Eat above TDEE
- Maintain: Match TDEE
See also our Calorie Calculator.