BMR Calculator
Work out your Basal Metabolic Rate — the calories your body burns at complete rest each day — using the Mifflin-St Jeor equation. Metric or imperial.
Not medical advice. This BMR calculator is for general information only and is not medical advice — speak to your GP before making changes to your diet or exercise routine.
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Your Basal Metabolic Rate appears here as you type.
How BMR is calculated
Basal Metabolic Rate (BMR) is the number of calories your body needs just to keep you alive at complete rest — breathing, circulating blood, growing and repairing cells. This calculator uses the Mifflin-St Jeor equation, the formula most widely recommended by dietitians today: for men it's 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5; for women it's the same but − 161 instead of + 5. Your BMR does not include any activity — if you want your total daily calorie needs including exercise, use our Calorie Maintenance (TDEE) calculator instead. This is an estimate only and doesn't account for muscle mass, genetics or medical conditions — speak to your GP for personalised advice.