How this calculator works
This calculator estimates Basal Metabolic Rate using the Mifflin-St Jeor equation with sex, weight, height, and age. Enter these values to see the estimated calories burned at complete rest. Use it as the foundation for calorie planning and understanding resting energy needs. The key inputs are weight, height, age, and sex. The output is the BMR in calories per day. Real-world applications include diet planning, nutrition education, and as a base for the calorie calculator. The calculator uses the Mifflin-St Jeor equation, which is considered one of the most accurate BMR formulas. BMR is the estimated calories your body burns at complete rest to support basic functions like breathing, circulation, and cell production. It is not the same as TDEE, which includes activity. TDEE is usually higher than BMR. Age is part of the equation because resting energy needs tend to change with age and body composition.