A complete, evidence-based guide to calculating your Total Daily Energy Expenditure — the most accurate way to set your calorie target.
Total Daily Energy Expenditure (TDEE) is the total number of calories your body expends in a 24-hour period. It has four components:
| Component | % of TDEE | Description |
|---|---|---|
| Basal Metabolic Rate (BMR) | 60–75% | Calories burned at complete rest |
| Thermic Effect of Activity (TEA) | 15–30% | Deliberate exercise |
| Non-Exercise Activity Thermogenesis (NEAT) | 6–10% | Movement outside structured exercise |
| Thermic Effect of Food (TEF) | 8–10% | Energy cost of digesting food |
Understanding your TDEE is the foundational step for any nutrition strategy — whether your goal is fat loss, muscle gain, or maintenance.
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
A 2005 systematic review in the Journal of the American Dietetic Association found Mifflin-St Jeor to be the most accurate predictive equation for non-obese adults, within 10% of measured BMR in 82% of subjects.
The Harris-Benedict equation (1919, revised 1984) tends to overestimate BMR by 5–15% in sedentary modern adults, partly because the original dataset consisted of highly active individuals. For athletes with high lean mass, Harris-Benedict may still be appropriate.
Multiply your BMR by the factor that best matches your weekly activity:
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Desk job, little or no exercise |
| Lightly active | 1.375 | Light exercise 1–3 days/week |
| Moderately active | 1.55 | Moderate exercise 3–5 days/week |
| Very active | 1.725 | Hard exercise 6–7 days/week |
| Extra active | 1.9 | Very hard exercise + physical job |
Practical tip: Most people overestimate their activity level. When in doubt, choose the lower multiplier and adjust based on real-world results.
No equation replaces real-world data. Use this protocol:
| Goal | Calorie Adjustment | Expected Rate |
|---|---|---|
| Aggressive fat loss | −500 kcal/day | ~0.5 kg/week |
| Moderate fat loss | −300 kcal/day | ~0.3 kg/week |
| Maintenance | 0 | — |
| Lean bulk | +200 kcal/day | ~0.2 kg/week |
| Aggressive bulk | +400 kcal/day | ~0.4 kg/week |
IIFYM (If It Fits Your Macros) is entirely dependent on TDEE accuracy. An underestimated TDEE means your "maintenance" target is actually a deficit — causing unintended weight loss. Recalibrate every 4–6 weeks as body composition changes.
Yes. Muscle tissue is metabolically active and burns approximately 6 kcal/kg/day more than fat tissue at rest. Athletes and individuals with high lean body mass will have a higher BMR than the Mifflin-St Jeor equation predicts. The Katch-McArdle formula (which uses lean body mass) is more accurate in these cases.
Recalculate after any significant change in body weight (>3–4 kg), activity level, or after 8–12 weeks of consistent intake. During a prolonged calorie deficit, metabolic adaptation can reduce actual TDEE by 5–10%, which is why recalibration matters.