Your Basal Metabolic Rate is the number of calories your body needs to perform basic, life-sustaining functions like breathing, circulation and cell production while at complete rest. This calculator uses the medically recognised Mifflin-St Jeor equation.
Your Basal Metabolic Rate is the number of calories your body needs to perform basic, life-sustaining functions like breathing, circulation and cell production while at complete rest. This calculator uses the medically recognised Mifflin-St Jeor equation. This calculator draws on peer-reviewed, industry-standard formulas used by fitness professionals, dietitians and clinicians worldwide, translated into a fast, easy-to-use browser tool.
Tracking metrics like this over time — rather than relying on a single reading — gives you a much clearer picture of trends in your health and fitness journey. Use this tool regularly alongside our other calculators for a fuller picture of your overall wellbeing.
BMR is the foundation for calculating your total daily calorie needs (TDEE) once activity level is factored in. It helps with building accurate weight loss, maintenance, or muscle gain plans.
We use the Mifflin-St Jeor equation, widely regarded by dietitians as more accurate than the older Harris-Benedict formula.
Men typically carry more lean muscle mass, which burns more calories at rest than fat tissue, resulting in a generally higher BMR.
Yes. BMR naturally declines with age due to gradual loss of muscle mass, which is why calorie needs typically decrease as we get older.