Understanding BMR and TDEE

Basal Metabolic Rate (BMR) represents the minimum amount of energy (calories) your body requires to function while resting. This includes energy needed for vital organs like the heart, lungs, brain, and liver, as well as basic cellular processes.

Total Daily Energy Expenditure (TDEE) is an estimation of how many calories you burn per day when exercise and physical activity are taken into account. It's calculated by multiplying your BMR by an activity multiplier.

How to Use Your TDEE for Dieting

Knowing your TDEE is the cornerstone of any nutritional plan. Whether your goal is to lose, maintain, or gain weight, your caloric intake relative to your TDEE will dictate your progress.

Weight Loss: To lose weight, you need to consume fewer calories than your TDEE. A common and sustainable deficit is 500 calories per day, which typically leads to about 1 lb (0.45 kg) of weight loss per week.
Maintenance: Consuming calories equal to your TDEE will allow you to maintain your current weight.
Bulking (Muscle Gain): To build muscle effectively, you need a caloric surplus. Consuming 250-500 calories above your TDEE provides the extra energy your body needs to synthesize new muscle tissue.

Which Formula Should You Choose?

The Mifflin-St Jeor equation is widely considered the most accurate formula for calculating BMR in modern populations. It was introduced in 1990 and tends to be more precise than older formulas.

The Harris-Benedict equation is an older formula originally created in 1919 and revised in 1984. While still commonly used, it may slightly overestimate calorie needs for some individuals, particularly those who are overweight or obese.