BMR & Calorie Calculator

Yes, completely free with no signup and no limits. Recalculate whenever your weight or activity changes, and everything runs privately in your own browser — your body measurements are never uploaded or stored anywhere, guaranteed.

Basal Metabolic Rate is the number of calories your body burns in 24 hours at complete rest, just to keep you alive — breathing, circulation, brain function and cell repair. It usually accounts for 60 to 75 percent of the calories you burn in a day, with activity and digestion making up the rest.

It is considered the most accurate widely used BMR equation without lab testing, and dietitians prefer it over older formulas. Still, it is an estimate: muscle mass, hormones, illness and medications all affect real calorie burn, so treat the result as a strong starting point, not a medical prescription.

The tool shows a mild weight-loss target about 500 calories below your daily needs, which typically leads to around half a kilogram of loss per week. Combine the calorie target with regular activity, and talk to a doctor or dietitian before starting any strict diet.