Short answer
Calorie calculators multiply your BMR by a factor from 1.2 (sedentary) to 1.9 (extremely active). Choosing one level too high adds around 300 calories to the result.
1. The five levels
| Activity level | Multiplier | Typical week |
|---|---|---|
| Sedentary | 1.2 | Desk job, little or no exercise |
| Light activity | 1.375 | Exercise 1–3 days a week |
| Moderate activity | 1.55 | Exercise 3–5 days a week |
| Very active | 1.725 | Hard exercise 6–7 days a week |
| Extremely active | 1.9 | Physical job plus training |
2. How much the choice changes the answer
Maintenance calories at each level for two example people. The man is 35, 80 kg and 178 cm with a BMR of about 1,743. The woman is 35, 65 kg and 165 cm with a BMR of about 1,345.
| Activity level | Man | Woman |
|---|---|---|
| Sedentary (1.2) | 2,091 | 1,614 |
| Light (1.375) | 2,396 | 1,850 |
| Moderate (1.55) | 2,701 | 2,085 |
| Very active (1.725) | 3,006 | 2,321 |
| Extremely active (1.9) | 3,311 | 2,556 |
Each step up adds about 300 calories for the man and about 235 for the woman. From sedentary to extremely active the man's estimate rises by 1,220 calories.
3. How to choose
- Count only regular exercise, and pick the level for the average week, not your best week.
- If you have a desk job and train three times a week, light or moderate activity is usually closer than very active.
- If you are between two levels, choose the lower one.
- Your daily steps and movement outside the gym matter too, so a sedentary job with a long walking commute is not quite sedentary.
4. Checking your choice against real life
Eat at your estimated maintenance for two to three weeks and track your weekly average weight. If it climbs, your real maintenance is lower than estimated. If it falls, it is higher. Move one level, or adjust by 100 to 200 calories, and test again.
5. Frequently asked questions
What is the activity multiplier in a calorie calculator?expand_more
It is the number that your BMR is multiplied by to account for daily movement and exercise, from 1.2 for sedentary up to 1.9 for extremely active.
Which activity level should I pick if I exercise 3 times a week?expand_more
Light activity (1.375) or moderate activity (1.55) is usually right. Choose light if the sessions are short or easy, and moderate if they are hard.
What happens if I pick the wrong activity level?expand_more
Each level changes the result by roughly 235 to 300 calories. Picking too high makes your target too high, which can stall weight loss.
Can my activity level change over time?expand_more
Yes. Recalculate when your training, job or daily steps change.