BMR calculator
An estimate of the calories your body uses at complete rest.
BMR
Rounded for displayBMR: ≈ 1,649 kcal/day
- BMR in kilojoules
- ≈ 6,898 kJ/day
- Mifflin–St Jeor
- ≈ 1,649 kcal/day
- Harris–Benedict (revised)
- ≈ 1,696 kcal/day
How it works
Basal metabolic rate is the energy used for breathing, circulation and other basic functions at rest. It is estimated from weight, height, age and sex.
The Mifflin–St Jeor equation (Mifflin et al., 1990) is the one most often recommended today. The Harris–Benedict equation dates from 1919; the version here is the 1984 revision by Roza and Shizgal. Both are shown so you can compare.
Individual results can differ from these estimates by 10% or more. This is a general estimate, not medical advice. For personal guidance, speak to a doctor or registered dietitian.
Formula
Mifflin–St Jeor: 10 × kg + 6.25 × cm − 5 × age + 5 (men) or − 161 (women) 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 1 kcal = 4.184 kJ
Worked example
A 30-year-old man weighing 70 kg and 175 cm tall: Mifflin–St Jeor gives 700 + 1,093.75 − 150 + 5 = 1,649 kcal a day. The revised Harris–Benedict equation gives 1,696 kcal.
Questions people ask
What is the difference between BMR and TDEE?
BMR is energy at rest. Total daily energy expenditure (TDEE) adds activity, and is usually 1.2 to 1.9 times BMR.
Which equation is more accurate?
Studies comparing them generally found Mifflin–St Jeor closer to measured values for most adults, but both are estimates.