BMR Calculator
Calculate your Basal Metabolic Rate, the calories your body burns at complete rest.
Basal Metabolic Rate (BMR) Calculator
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What BMR Means
Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic life functions — breathing, circulation, cell production — while completely at rest. It typically accounts for 60-75% of your total daily calorie burn.
This calculator uses the Mifflin-St Jeor equation, widely regarded as one of the most accurate BMR formulas available for general use. To see your total daily calorie needs including activity, use our full Calorie Calculator.
Frequently Asked Questions
What's the difference between BMR and TDEE?
BMR is calories burned at complete rest, while TDEE (Total Daily Energy Expenditure) adds in calories burned through daily activity and exercise. Use the Calorie Calculator for your full TDEE.
Can I eat below my BMR safely?
Eating consistently below your BMR is generally discouraged as it may not provide enough energy for basic bodily functions, consult a healthcare provider before pursuing very low calorie diets.
Does muscle mass affect BMR?
Yes, more muscle mass generally increases BMR because muscle tissue burns more calories at rest than fat tissue, though this formula estimates BMR from weight, height, age, and sex only.