BMR calculator
Your basal metabolic rate, the energy your body uses at rest, by the Mifflin–St Jeor equation. Free, with no account or uploads.
Your basal metabolic rate
Type your age, sex, height and weight. The energy at rest leads, with a day's energy beside it.
The formulas were measured separately for women and men.
Sitting work, getting about by car or bus, little exercise.
At rest (BMR)
About 1,350 calories a day
Resting energy by Mifflin–St Jeor. With your activity (× 1.53) a day comes to about 2,060.
FAO/WHO/UNU: 1.40–1.69 sedentary or light, 1.70–1.99 active, 2.00–2.40 vigorous.
A little help along the way
Follow these steps. Every option is explained underneath. Everything runs in your browser; nothing is sent anywhere or kept.
- Say what you want to knowBMI, calories a day, or body fat.
- Choose your measuresCentimetres and kilograms, or feet, inches and pounds.
- Type your age, height and weightAnd your sex for calories, body fat and a child's BMI; for body fat, your waist, neck and hips.
- Read the answerIn words first, with the formula it came from.
Questions people ask
- What is BMR?
- Basal metabolic rate: the energy your body uses in a day at complete rest, to breathe, keep warm and keep its organs working.
- Why Mifflin–St Jeor and not Harris–Benedict?
- Mifflin–St Jeor (1990) was made from more recent measurements and is the one the US Academy of Nutrition and Dietetics' review found closest for most adults.
- Does it work for children?
- No. It was made from adults of 19 to 78, and the page says so when the age is under 18.
This page is the BMI and calorie calculator, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the BMI and calorie calculator's own page.
Read the step-by-step guide