Mifflin-St Jeor equation. Calculates resting metabolic rate plus daily targets for maintenance, deficit, and surplus.
Enter your inputs. Maintenance calories appear here, with deficit/surplus targets in a hairline panel below.
Basal Metabolic Rate (BMR) is the energy your body burns at complete rest — breathing, circulation, cell production. The Mifflin-St Jeor equation (1990) is now the clinically preferred formula because it tracks measured resting metabolic rate roughly 5% closer than the older Harris-Benedict revision.
Disclaimer. Estimates only. Individual calorie needs vary with body composition, medications, and health conditions. Consult a dietitian for personalized advice.