BMR Calculator
Estimate your Basal Metabolic Rate using the Mifflin-St Jeor equation to see how many calories your body burns at rest each day.
Your results
Calculation breakdown
- Mifflin-St Jeor (men)
- BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5
- Mifflin-St Jeor (women)
- BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161
Worked example
A 32-year-old man who is 175 cm tall and weighs 78 kg has an estimated BMR of about 1,742 kcal/day, the calories burned at complete rest.
Assumptions
- Uses the Mifflin-St Jeor equation, generally more accurate than older formulas for most adults.
- Does not account for body composition, medical conditions or medications affecting metabolism.
How this calculator works
This calculator estimates your Basal Metabolic Rate (BMR), the number of calories your body burns at complete rest to maintain basic functions, using the widely used Mifflin-St Jeor equation based on your sex, age, height and weight. BMR is the starting point for working out your total daily energy needs, which is why it feeds into the TDEE calculator on this site.
Frequently asked questions
What is BMR?
BMR is the number of calories your body needs at complete rest just to keep vital functions like breathing and circulation running.
Which formula does this use?
This calculator uses the Mifflin-St Jeor equation, generally considered more accurate than older formulas like Harris-Benedict.
Is BMR the same as the calories I should eat?
No, BMR only reflects resting energy use; use the TDEE calculator to account for activity level and daily calorie needs.
Results are estimates only and are not financial, tax, legal or credit advice.