BMR Calculator (Mifflin-St Jeor)
Your basal metabolic rate is the energy your body uses at complete rest — breathing, circulating blood, keeping warm. This calculator uses the Mifflin-St Jeor equation, the one most dietitians start from today.
Basal metabolic rate
kcal/day
Enter your age, height and weight
About kcal an hour, at complete rest
Mifflin-St Jeor (1990)
This is what your body burns at rest — not what you should eat. Your daily needs include activity: see the TDEE Calculator.
Your results are attached to the form below
These figures are estimates for general awareness only and are not medical advice or a diagnosis. Read our Medical Disclaimer.
Want a Plan Built Around Your Numbers?
A certified dietitian will turn these figures into a diet that fits your routine and your food.
How this is calculated
Mifflin-St Jeor (Mifflin et al., American Journal of Clinical Nutrition, 1990): women BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161; men the same but + 5 instead of − 161. The published coefficients (9.99 and 4.92) are conventionally rounded to 10 and 5.
Why Mifflin-St Jeor?
A 2005 systematic review for the American Dietetic Association compared the four equations most used in practice — Harris-Benedict, Mifflin-St Jeor, Owen and WHO/FAO/UNU. Mifflin-St Jeor predicted resting metabolism within 10% of the measured value in more people, both normal-weight and obese, than any of the others.
Its limits
The same review noted that older adults and ethnic minorities were under-represented in the studies, and ICMR-NIN has found that international equations tend to overestimate Indians' resting metabolism. Treat the result as an estimate: the BEE Calculator shows ICMR-NIN's own adjustment for Indian adults.
Other BMR methods
See the Harris-Benedict Calculator for the classic equation, the Katch-McArdle Calculator if you know your body fat, or the RMR Calculator for resting metabolic rate. To turn BMR into daily calories, use the TDEE Calculator.
More Diet & Nutrition Calculators
See all →- Protein Calculator Find your daily protein requirement using ICMR-NIN 2020, with separate figures for exercise, age 65+, pregnancy and breastfeeding.
- Calorie Deficit Calculator See your maintenance calories and a daily calorie target for weight loss, with two BMR formulas side by side.
- Macro Calculator Split your daily calories into grams of protein, carbohydrate and fat — balanced, higher-protein or your own ratio.
- Calorie Calculator How many calories do you need a day? See three recognised methods side by side — the clinic's, the US standard and India's ICMR-NIN.
- TDEE Calculator Your total daily energy expenditure with four BMR equations compared, and a breakdown of how much goes on rest, digestion and activity.
- Maintenance Calorie Calculator The calories that keep your weight steady — today, and at your goal weight, so you know what to eat once you get there.