TDEE Explained: What Is Total Daily Energy Expenditure?

The Four Components of TDEE

BMR (Basal Metabolic Rate) — 60–70% of TDEE. This is an estimate of the calories your body burns at complete rest just to keep vital functions running (breathing, circulation, cell repair). BMR is influenced primarily by lean muscle mass — which is one reason building and maintaining muscle can modestly raise your resting calorie burn over time.

TEF (Thermic Effect of Food) — ~10% of TDEE. Calories burned digesting food. Protein has the highest thermic effect (20–30% of its calories), which is one reason high-protein diets aid fat loss.

EAT (Exercise Activity Thermogenesis) — 5–30%. Calories from intentional exercise — gym sessions, runs, sport.

NEAT (Non-Exercise Activity Thermogenesis) — 15–50%. The most underrated component. All movement that is not structured exercise: walking to your car, fidgeting, standing, cleaning. Research by Levine et al. found NEAT can vary by up to 2,000 calories per day between people of similar size.

Why NEAT Matters So Much

Two people of similar size can have TDEEs that differ by 600–800 calories per day largely because of NEAT differences. A sedentary person who sits still most of the day typically burns noticeably less than someone who fidgets, stands, and moves frequently throughout the day. This is one reason some people appear to eat more without gaining weight. Increasing your daily step count to roughly 8,000–12,000 is a practical way to raise TDEE without adding formal exercise, though individual results vary.

How to Use Your TDEE

Fat loss: Subtract roughly 500 calories from your TDEE. This is commonly estimated to produce about 0.5kg of fat loss per week, a moderate pace generally considered easier to sustain and more likely to preserve muscle than a more aggressive deficit.

Muscle gain: Add roughly 200–300 calories to your TDEE. A modest surplus ("lean bulk") tends to support muscle gain while limiting fat gain, though the ideal surplus varies by individual and training experience.

Maintenance: Eat at your estimated TDEE. Track your weight for 2–3 weeks and adjust your intake based on the trend, since TDEE calculators only provide a starting estimate.