Basal Metabolic Rate Calculator

Calories expended while at rest: 0 kcal/day

Understanding BMR and the Mifflin-St Jeor Equation

Basal Metabolic Rate (BMR) is the amount of energy expended while at rest in a neutrally temperate environment, in the post-absorptive state. The Mifflin-St Jeor Equation is a widely accepted method to calculate BMR, considering it more accurate than older formulas for modern populations.

Mifflin-St Jeor Equation

For men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5

For women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161

Pros and Cons of BMR Measurements


  • Accurate estimation of caloric needs.
  • Simple calculation with minimal required information.


  • Does not account for muscle-to-fat ratio.
  • May not perfectly fit individual metabolic rates.

The preference for the Mifflin-St Jeor equation over others like the Harris-Benedict equation or the Katch-McArdle formula is due to its accuracy and simplicity, making it suitable for general dietary planning and weight management.

For more detailed information on BMR and its calculations, the following resources are recommended:

Resting Metabolic Rate: Best Ways to Measure It—And Raise It, Too
What to know about basal metabolic rate