Activity Factors for Estimating TDEE
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Multiply BMR by an activity factor (1.2 sedentary up to ~1.9 extremely active) to estimate total daily calorie needs.
Detail
An activity factor is a multiplier applied to BMR (see bmr-estimation) to estimate total daily energy expenditure (see tdee). The widely used scale:
| Activity level | Description | Factor |
|---|---|---|
| Sedentary | Little/no exercise, desk job | 1.2 |
| Lightly active | Light exercise 1–3 days/week | 1.375 |
| Moderately active | Moderate exercise 3–5 days/week | 1.55 |
| Very active | Hard exercise 6–7 days/week | 1.725 |
| Extremely active | Very hard exercise + physical job, or 2×/day training | 1.9 |
TDEE = BMR × activity factor. Example: a BMR of 1,600 kcal at "moderately active" (1.55) ≈ 2,480 kcal/day.
The most common mistake is picking too high a level — many people overrate their activity, which can inflate the estimate by hundreds of calories and stall fat loss. When unsure, choose the lower bracket. Factors bundle both exercise and non-exercise movement (NEAT), so a desk worker who trains hard but is otherwise still may sit between brackets. Treat the result as a starting estimate and adjust to the 10–14 day weight trend (see calorie-targets).
Key facts
- Sedentary 1.2 / light 1.375 / moderate 1.55 / very active 1.725 / extreme 1.9.
- TDEE = BMR × activity factor.
- Overestimating activity is the main error — choose lower if unsure.
- Factors include exercise and non-exercise movement.
- Verify and adjust against a 10–14 day weight trend.
Connections
- bmr-estimation — the value the factor multiplies.
- tdee — what the multiplication produces.
- calorie-targets — applying TDEE to a goal.
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.