Which clinical formula is most accurate for calculating Basal Metabolic Rate?

The Mifflin-St Jeor (1990) equation is recognized by the Academy of Nutrition and Dietetics as the most accurate predictive standard for healthy adults (within 10% of indirect calorimetry), while the Katch-McArdle (1996) equation is preferred for muscular athletes who know their exact body fat percentage.

How does Total Daily Energy Expenditure (TDEE) differ from BMR?

Basal Metabolic Rate (BMR) measures resting cellular and organ energy burn (60% to 75% of daily expenditure), whereas Total Daily Energy Expenditure (TDEE) multiplies BMR by an ACSM physical activity coefficient (1.2x to 1.9x) to account for Non-Exercise Activity Thermogenesis (NEAT), Thermic Effect of Food (TEF), and Exercise Activity Thermogenesis (EAT).

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