HEALTH · BMR
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at rest — using the Mifflin-St Jeor equation, with Harris-Benedict as an alternate.
Basal Metabolic Rate
1,699 cal/day
Mifflin-St Jeor (recommended)
Mifflin-St Jeor1,699 cal/day
Harris-Benedict (alternate)1,763 cal/day
About This Calculator
Your Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest to keep vital functions running. It is the foundation for estimating your total daily calorie needs.
How It Works
Enter your height, weight, age, and biological sex. The calculator uses the Mifflin-St Jeor equation — the most accurate general-purpose formula — and also shows the Harris-Benedict result for comparison. Biological sex is required because the formulas use sex-specific constants.
The Formula
BMR = 10·kg + 6.25·cm − 5·age + s (s = +5 male, −161 female)
- kg
- weight in kilograms
- cm
- height in centimetres
- age
- age in years
- s
- sex constant (+5 male, −161 female)
Frequently Asked Questions
- Which BMR formula is most accurate?
- The Mifflin-St Jeor equation (1990) is considered the most accurate for the general population and is the default here. The older Harris-Benedict equation tends to overestimate slightly; it is shown as an alternate.
- Why does the calculator ask for biological sex?
- The BMR formulas use sex-specific constants derived from average body composition differences. The field refers to biological sex because it maps to those formula constants, not to gender identity.
- What is the difference between BMR and TDEE?
- BMR is the calories you burn at rest. TDEE (Total Daily Energy Expenditure) multiplies BMR by an activity factor to estimate the calories you burn across a full day including movement and exercise.