BMR Calculator

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Understanding Your Basal Metabolic Rate

Your Basal Metabolic Rate (BMR) is the total number of calories your body requires to perform basic, life-sustaining functions (like breathing, circulating blood, and cellular production) if you were to rest in bed for a full 24 hours. Our US-standard BMR Calculator uses the Mifflin-St Jeor equation, considered the most accurate formula by the American Dietetic Association.

Why BMR Matters for Weight Loss

Understanding your BMR is the very first step in any weight management journey. Your BMR makes up about 60% to 75% of your total daily calorie burn. By adding your physical activity levels to your BMR, you calculate your Total Daily Energy Expenditure (TDEE).

To lose weight safely, health experts generally recommend eating 300 to 500 calories below your TDEE (but never below your BMR without medical supervision).

Frequently Asked Questions

How can I increase my BMR?

The most effective way to permanently increase your BMR is by building lean muscle mass through resistance training. Muscle tissue burns more calories at rest than fat tissue.

Is the Mifflin-St Jeor equation accurate for everyone?

While it is the gold standard for the general population, it may overestimate calories for obese individuals and underestimate them for elite athletes with massive muscle mass.