How to use the BMR Calculator
- Enter age, sex, height and weight.
- Press “Calculate” to see your BMR in kcal per day.
Formula used
BMR is estimated with the Mifflin-St Jeor equation, which research has found to be among the most accurate for healthy adults: men: 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5; women: 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161.
Daily energy needs (TDEE) are BMR multiplied by an activity factor: 1.2 (sedentary), 1.375 (light), 1.55 (moderate), 1.725 (very active), 1.9 (extra active).
BMR vs TDEE
BMR is only the energy used at rest. You also burn calories by moving, exercising and digesting food. Total Daily Energy Expenditure (TDEE) includes all of that, and it is the number to use when planning how much to eat.
Frequently asked questions
Should I eat my BMR in calories?
Generally no. Eating only your BMR is below your total needs. Use the TDEE or Calorie Calculator for intake targets.
Why does BMR go down with age?
Muscle mass tends to decrease with age, which lowers resting energy use.