BMR calculator
Your basal metabolic rate (BMR) is the energy your body uses at rest. See it with both the Mifflin-St Jeor and Harris-Benedict equations.
Your result appears here as you type.
The two equations
Mifflin-St Jeor is the one most dietitians use today. The revised Harris-Benedict equation is older and usually gives a slightly higher number.
- Mifflin-St Jeor, men: 10 × kg + 6.25 × cm − 5 × age + 5.
- Mifflin-St Jeor, women: 10 × kg + 6.25 × cm − 5 × age − 161.
- Harris-Benedict, men: 88.362 + 13.397 × kg + 4.799 × cm − 5.677 × age.
- Harris-Benedict, women: 447.593 + 9.247 × kg + 3.098 × cm − 4.330 × age.
What changes your BMR
- Size: larger bodies use more energy.
- Muscle: it burns more at rest than fat does.
- Age: BMR falls slowly as you get older.
- Thyroid disease and some medicines can change it, and these equations cannot see that.
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What is a normal BMR?
It depends on your size, age and sex. Many adult women are around 1,200 to 1,500 kcal a day, and many adult men around 1,500 to 1,900 kcal a day.
Should I eat only my BMR in calories?
No. BMR is what you burn lying still, so eating only that usually leaves too little for a normal day. Use your TDEE instead.
Can I raise my BMR?
Building muscle helps a little, and staying active helps more by raising your total daily energy use.
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