TDEE = BMR × Activity Factor • Sedentary (1.2) • Lightly Active (1.375) • Moderately Active (1.55) • Very Active (1.725) • Extra Active (1.9)
TDEE multiplies your baseline BMR by a validated activity multiplier to reflect daily movement and exercise energy expenditure.
Clinical Limitations & Considerations
Activity multipliers rely on self-reported activity levels, which humans frequently overestimate. Fitness trackers and heart-rate monitors also carry an error margin of 10-20%. Track body weight over 2-3 weeks to confirm your true empirical maintenance baseline.
Scientific References & Literature
- FAO/WHO/UNU Expert Consultation (2004). "Human energy requirements." WHO Technical Report Series, No. 1.
- Westerterp, K. R. (2013). "Physical activity and physical activity induced energy expenditure in humans." Current Opinion in Clinical Nutrition & Metabolic Care, 16(6), 635-642.
Frequently Asked Questions
How accurate is a TDEE calculator?
TDEE calculators provide a reliable scientific estimate within ±10% for most individuals. Tracking daily food intake and average weekly scale weight allows you to fine-tune your actual empirical maintenance TDEE.
What is the difference between BMR and TDEE?
BMR is the energy burned if you stay in bed all day doing nothing. TDEE includes all daily walking, working, chores, digesting food, and exercise workouts.