BMR Calculator
Calculate your Basal Metabolic Rate (BMR) using scientifically validated formulas to understand your resting calorie expenditure.
✓ Runs in your browser · Updated 2026-03-31Enter values and click Calculate BMR to see results
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, cell production, and nutrient processing while at complete rest. It represents the minimum energy your body requires to function.
Mifflin-St Jeor Equation
The Mifflin-St Jeor equation is considered the most accurate formula for estimating BMR and is recommended by the Academy of Nutrition and Dietetics.
Male: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − + 5
Female: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161
Harris-Benedict Equation
The Harris-Benedict equation was one of the earliest BMR formulas, published in 1919 and revised in 1984. While slightly less accurate than Mifflin-St Jeor, it is still widely used.
Male: BMR = 88.362 + 13.397 × weight(kg) + 4.799 × height(cm) − 5.677 × age
Female: BMR = 447.593 + 9.247 × weight(kg) + 3.098 × height(cm) − 4.330 × age
How to Use Your BMR
Your BMR is the foundation of understanding your daily calorie needs. To find your Total Daily Energy Expenditure (TDEE), multiply your BMR by an activity factor. Use our TDEE Calculator to determine your total daily calorie needs including physical activity.
Related Tools
- TDEE Calculator – Find your total daily energy expenditure
- Calorie Calculator – Calculate daily calorie needs by goal
- Body Fat Calculator – Estimate your body fat percentage
Frequently Asked Questions
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while completely at rest.
How is BMR different from TDEE?
BMR only accounts for calories burned at rest, while TDEE (Total Daily Energy Expenditure) includes BMR plus calories burned through physical activity and digestion.