BMR Calculator
BMR calculator: find your basal metabolic rate, the calories your body burns at rest, using Mifflin-St Jeor and Harris-Benedict.
Editorial review: Farrow (pseudonym; identity and professional credentials are not disclosed). This page is for educational purposes, not professional advice.
Updated
Your inputs
Results update as you type. Nothing you enter leaves your device.
Results
- BMR (Harris-Benedict)
- 1,458 kcal/day
- Calories burned per hour at rest
- 58 kcal
Example with the starting values
These results use the calculator's initial inputs. Change the values above to calculate your own estimate.
Inputs
- Sex
- Female
- Age
- 30 years
- Weight
- 150 lb
- Height
- 65 in
Results
- BMR (Mifflin-St Jeor)
- 1,401 kcal/day
- BMR (Harris-Benedict)
- 1,458 kcal/day
- Calories burned per hour at rest
- 58 kcal
How does the BMR Calculator work?
Mifflin-St Jeor: 10 × kg + 6.25 × cm − 5 × age, + 5 (men) or − 161 (women). The revised Harris-Benedict equation uses different coefficients and usually lands within about 5% of it.
BMR is the energy your body needs at complete rest. Multiply it by an activity factor, or use the TDEE calculator, to estimate your daily calories.
Frequently asked questions
What is BMR?
Basal metabolic rate is the calories your body burns at rest to keep your heart, lungs and brain running.
Which formula is more accurate?
Mifflin-St Jeor is generally considered the more reliable for most adults. Both are estimates.
Can BMR change?
Yes. It rises with muscle mass and weight and tends to decline with age.
Is BMR the same as TDEE?
No. BMR is calories at complete rest. TDEE adds daily movement and exercise on top of it.