Health & Fitness Calculators

BMR Calculator

Your basal metabolic rate (BMR) is the energy your body uses at complete rest to keep you alive: breathing, circulation, temperature and cell repair. It is the starting point for working out daily calorie needs.

BMR (Mifflin–St Jeor)1,649 kcal/day

BMR (Harris–Benedict, revised): 1,696 kcal/day
Per hour: 68.7 kcal

Step-by-step working

Mifflin–St Jeor: 10 × 70 + 6.25 × 175 − 5 × 30 + 5 = 1,649

Mifflin–St Jeor is generally considered the more accurate of the two for most adults. Multiply BMR by an activity factor to estimate total daily needs; the TDEE Calculator does this for you.

How to use the BMR Calculator

Choose units and sex.
Enter age, weight and height.
Press Calculate.

Formula

Mifflin–St Jeor (kcal/day): 10 × weight(kg) + 6.25 × height(cm) − 5 × age + s, where s = +5 for males and −161 for females.

Harris–Benedict (Roza & Shizgal, 1984): men 88.362 + 13.397W + 4.799H − 5.677A; women 447.593 + 9.247W + 3.098H − 4.330A.

Examples

Man, 30, 70 kg, 175 cm: 700 + 1,093.75 − 150 + 5 = 1,649 kcal/day.

Frequently asked questions

Is BMR the same as RMR?

They are close. Resting metabolic rate is measured under slightly less strict conditions and is usually a little higher.