BMR Calculator
Calculate your basal metabolic rate — the calories your body burns at complete rest — with three common formulas.
| Formula | Calories a day |
|---|
For healthy adults. These are estimates, not medical advice. Ask a doctor or dietitian about your own targets — especially if you are pregnant, have a health condition or are under 18.
BMR formulas
Harris-Benedict (revised, men): 88.362 + 13.397 × kg + 4.799 × cm − 5.677 × age
Harris-Benedict (revised, women): 447.593 + 9.247 × kg + 3.098 × cm − 4.330 × age
Katch-McArdle: 370 + 21.6 × lean body mass (kg)
Example: a 35-year-old man, 175 cm and 75 kg: Mifflin-St Jeor gives 1,674 kcal, Harris-Benedict 1,734 kcal a day.
BMR is not what you burn in a day
BMR covers breathing, circulation and other basic functions at rest. Daily activity, exercise and digesting food come on top — see the TDEE calculator for your total.
Frequently asked questions
What is a normal BMR?
For most adults between about 1,200 and 2,000 kcal a day, higher for taller, heavier and younger people and for men.
Which BMR formula is most accurate?
Mifflin-St Jeor is generally the most accurate for adults. Katch-McArdle can be better for lean, muscular people when body fat is known.