What is the BMR Calculator?
The Basal Metabolic Rate (BMR) Calculator estimates the absolute minimum number of calories your body requires to perform basic life-sustaining functions (like breathing, cell production, and circulation) if you were resting in bed all day. (Supports both metric and imperial inputs).
How to Calculate Basal Metabolic Rate (Formulas)
The most accurate and widely adopted modern formula is the 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
Frequently Asked Questions
What is the difference between BMR and TDEE?
BMR represents the calories burned at complete rest. TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor (e.g., sedentary, lightly active, very active) to calculate the total amount of calories you actually burn in a normal day.
Does muscle mass affect BMR?
Yes. Muscle tissue is metabolically active, meaning it requires more energy to maintain than fat tissue. Therefore, an individual with a high muscle mass will have a significantly higher BMR than someone of the exact same weight with high body fat.
Can eating less slow down my BMR?
Yes, through a process called metabolic adaptation. Severe caloric restriction over long periods signals the body to conserve energy, slightly lowering your BMR to prevent starvation. This is why aggressive crash diets often lead to plateaus.