Activity Multipliers (PAL) — How to Pick Yours Honestly
The activity multiplier is where most TDEE estimates go wrong. Here's what each level actually means — and how to choose without inflating your number.
What an activity multiplier really is
Once you have your BMR, you multiply it by a Physical Activity Level (PAL) factor to estimate total daily energy expenditure. The values come from the 2001 FAO/WHO/UNU report, Human Energy Requirements, which categorized lifestyles by measured doubly-labeled water studies.
PAL is your average daily energy expenditure divided by your BMR. A truly sedentary office worker averages ~1.4. A traditional subsistence farmer averages ~1.9–2.1.
The standard multipliers
| Multiplier | Label | What it means |
|---|---|---|
| 1.2 | Sedentary | Desk job, mostly seated commute, <5,000 steps/day, no formal exercise. |
| 1.375 | Lightly active | 1–3 light workouts per week (or 6–10k steps/day with a desk job). |
| 1.55 | Moderately active | 3–5 workouts/week, OR a job with significant standing/walking. |
| 1.725 | Very active | 6–7 intense workouts per week + active hobbies. |
| 1.9 | Athlete | Two-a-day training, or hard physical labor + training. |
Why most people pick wrong
A common pattern: someone does CrossFit three times a week, sits at a desk the rest of the day, and picks “moderately active” (1.55). That’s almost always too high. Three one-hour workouts burn ~900–1,200 cal/week — about 130–170 cal/day on average. Spread that across a BMR of ~1,500 and you’re at PAL ~1.4, not 1.55.
A more honest approach
- Start one level lower than your gut says. If you think you’re “moderately active,” start with 1.375.
- Test for 14 days. Eat at the calculated TDEE, weigh yourself daily, average by week.
- Adjust. If weight is stable, you picked right. If you lost weight, bump the multiplier up by 0.1. If you gained, drop it by 0.1.
A second-opinion method: TDEE = BMR + activity calories
If you have a reasonably accurate step counter:
TDEE ≈ BMR × 1.2 + (steps × 0.04) + (workout calories × 0.7)
The 0.7 multiplier on workout calories accounts for the typical 20–30% overestimate in fitness-tracker burn numbers.
Try it
Apply your multiplier in the TDEE calculator or the maintenance calorie calculator.
Sources
- FAO/WHO/UNU. Human Energy Requirements: Report of a Joint FAO/WHO/UNU Expert Consultation. FAO Food and Nutrition Technical Report Series, 2001.
- Westerterp KR. Physical activity and physical activity induced energy expenditure in humans: measurement, determinants, and effects. Front Physiol. 2013;4:90.