BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at complete rest. See results from three formulas, plus your TDEE at different activity levels.
Your results
What is BMR?
Your Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions at complete rest — breathing, circulating blood, cell production, and maintaining body temperature. BMR accounts for 60–75% of your total daily calorie expenditure.
The Mifflin-St Jeor equation
The Mifflin-St Jeor equation, developed in 1990, is considered the most accurate BMR formula for the general population. For men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5. For women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161.
BMR vs TDEE
Your TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor ranging from 1.2 (sedentary) to 1.9 (very active). To lose weight, eat below your TDEE. To gain weight, eat above it. A deficit or surplus of 500 calories per day typically results in ~1 lb of weight change per week.
Related: Calorie Calculator · Macro Calculator · BMI Calculator