Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation
About BMR
BMR represents the number of calories your body burns at rest to maintain basic life functions like breathing, circulation, and cell production. The Mifflin-St Jeor equation is considered the most accurate formula for estimating BMR.
How it works
Estimates Basal Metabolic Rate, the calories your body burns at complete rest to maintain vital functions. BMR accounts for 60-75% of total daily calorie needs for most adults.
BMR (men) = 10·mass + 6.25·height − 5·age + 5 BMR (women) = 10·mass + 6.25·height − 5·age − 161 (Mifflin-St Jeor)
massbody weight in kgheightstanding height in cmageage in years
- 10 × 80 = 800
- 6.25 × 180 = 1125
- 5 × 35 = 175
- 800 + 1125 − 175 + 5 = 1755
- Multiply BMR by an activity factor (1.2-1.9) to estimate TDEE.
- Mifflin-St Jeor is more accurate for modern populations than the older Harris-Benedict formula.
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Frequently Asked Questions
Basal Metabolic Rate is the number of calories your body burns at complete rest just to keep basic functions running: breathing, circulation, cell production. It accounts for 60-75% of total daily calories for most people.
The modern standard. For men: BMR = 10×weight(kg) + 6.25×height(cm) - 5×age + 5. For women: subtract 161 instead of adding 5. It is more accurate than the older Harris-Benedict formula.
Genetics, age (BMR drops ~2% per decade after age 20), muscle mass (muscle burns more at rest than fat), hormones (thyroid especially), and body temperature all influence BMR.