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Learn the science behind metabolic rates, active energy expenditure, and how to fuel your body effectively for your goals.
Basal Metabolic Rate is the number of calories your body needs to perform basic life-sustaining functions at complete rest — breathing, circulation, and cell production.
Total Daily Energy Expenditure is your BMR multiplied by an activity factor. It represents the total calories you burn in a day including exercise and movement.
This calculator uses the Mifflin-St Jeor equation, considered the most accurate for estimating BMR. It's recommended by dietitians over older formulas like Harris-Benedict.
Protein, carbohydrates, and fats each play different roles. A balanced split supports energy levels, muscle maintenance, and hormonal health simultaneously.