BMR Calculator
Calculate your Basal Metabolic Rate
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Basic Information
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BMR Equation
What is BMR?
Your Basal Metabolic Rate (BMR) is the number of calories you burn as your body performs basic (basal) life-sustaining functions. Commonly also called Resting Metabolic Rate (RMR), which is the calories burned if you stayed in bed all day.
BMR Equations
- Mifflin-St Jeor Equation: Considered the most accurate for calculating BMR
- Revised Harris-Benedict Equation: Updated version of the original Harris-Benedict
- Original Harris-Benedict Equation: The original equation from 1919
Activity Level Multipliers
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Little or no exercise | BMR × 1.2 |
| Lightly active | Light exercise 1-3 days/week | BMR × 1.375 |
| Moderately active | Moderate exercise 3-5 days/week | BMR × 1.55 |
| Very active | Hard exercise 6-7 days/week | BMR × 1.725 |
| Extra active | Very hard exercise & physical job | BMR × 1.9 |
Factors Affecting BMR
Your BMR is influenced by several factors: age, weight, height, gender, body composition, and genetic factors. Muscle mass is particularly important - the more muscle you have, the higher your BMR.