Key takeaways
- A multiplier of 1.55 means you burn 55% more in a day than you would lying still.
- The classic factors are a convention, not the result of a single study, and they are on the cautious side.
- In-between values such as 1.3 or 1.45 are fine if they describe your week better.
- Your real multiplier is your measured TDEE divided by your BMR, and two to four weeks of data reveal it.
On this page
- The five multipliers
- What the multiplier really measures
- Where the classic numbers come from
- How much each step changes your calories
- One person at every multiplier
- Your multiplier can drift while you diet
- Using in-between values
- Find your own multiplier
- What the multiplier includes, and what it doesn’t
- Special cases
- Activity multiplier questions
The five multipliers
| Level | Multiplier | Description | Burn above rest |
|---|---|---|---|
| Sedentary | 1.2 | Desk job, little or no exercise | +20% |
| Lightly active | 1.375 | Light exercise 1 to 3 days a week | +37.5% |
| Moderately active | 1.55 | Moderate exercise 3 to 5 days a week | +55% |
| Very active | 1.725 | Hard exercise 6 to 7 days a week | +72.5% |
| Athlete | 1.9 | Training twice a day or a physical job plus exercise | +90% |
TDEE = BMR × multiplier
The multiplier covers everything that isn’t resting metabolism: the energy used to digest food (about 10% of what you eat), everyday movement such as walking, standing and chores, and planned exercise. Because digestion alone uses a sizeable chunk, even the sedentary level of 1.2 leaves little room for movement.
What the multiplier really measures
Scientists call TDEE divided by BMR the physical activity level, or PAL. It is a neat way to compare people of different sizes: a small woman and a large man with the same lifestyle have similar PALs even though their calorie needs differ a lot. Calculator multipliers are simply PAL estimates.
When researchers measure PAL directly with doubly labelled water, they find a wide range. The FAO/WHO/UNU expert report on human energy requirements describes three broad lifestyle bands:
| FAO/WHO/UNU lifestyle | Measured PAL | Closest calculator levels |
|---|---|---|
| Sedentary or light activity | 1.40 to 1.69 | Lightly to moderately active |
| Active or moderately active | 1.70 to 1.99 | Very active to athlete |
| Vigorous or vigorously active | 2.00 to 2.40 | Beyond the usual calculator scale |
Notice the mismatch. A lifestyle the FAO calls sedentary measures 1.4 or more, while calculators use 1.2. The classic factors are cautious.
Where the classic numbers come from
The 1.2 to 1.9 scale doesn’t come from one landmark study. It is a long-standing convention from nutrition and exercise texts, often called the “Harris-Benedict factors” even though Harris and Benedict only published resting metabolism equations. Online calculators adopted it, and it became the standard.
Why has a cautious scale survived? Partly habit, and partly because it works reasonably well as a starting point for weight loss. People tend to overestimate how active they are and underestimate how much they eat, and a lower multiplier balances that out. The trade-off is that people who move a lot without “exercising” can be underestimated. That is one reason to check your number against your own weight trend.
How much each step changes your calories
Here is a detail most people miss: each step on the scale adds exactly 0.175 to the multiplier. So every level up adds the same number of calories, 17.5% of your BMR.
| Your BMR | Each level up adds | Sedentary → very active |
|---|---|---|
| 1,200 kcal | 210 kcal | 630 kcal |
| 1,500 kcal | 263 kcal | 788 kcal |
| 1,800 kcal | 315 kcal | 945 kcal |
| 2,100 kcal | 368 kcal | 1,103 kcal |
In percentage terms, the steps shrink as you go up: about +15% from sedentary to lightly active, +13% to moderately active, +11% to very active and +10% to athlete. Either way, one wrong click is worth more than a typical diet’s deficit.
One person at every multiplier
A 40-year-old man, 180 cm (5′11″) and 85 kg (187 lb), has a Mifflin-St Jeor BMR of 1,780 kcal. Here is his TDEE, and a 20% fat-loss target, at each level:
| Multiplier | TDEE | Fat-loss target (−20%) |
|---|---|---|
| 1.2 sedentary | 2,136 | 1,709 |
| 1.375 lightly active | 2,448 | 1,958 |
| 1.55 moderately active | 2,759 | 2,207 |
| 1.725 very active | 3,070 | 2,456 |
| 1.9 athlete | 3,382 | 2,706 |
If he is really lightly active but picks moderately active, his “fat-loss” target of 2,207 kcal is only about 10% below what he burns, so he loses half as fast as he expected. If he picks very active, his target lands right on his real maintenance. The multiplier decides whether a plan works far more than the equation does.
Your multiplier can drift while you diet
When people eat less, they often move less without noticing: fewer trips to the kitchen, more sitting, slower walking. Research on everyday movement shows how large these unplanned changes can be. So a multiplier that fitted at the start of a diet can be too high a few months in. Keep an eye on your step count, and if your loss slows, check whether your daily movement has fallen before cutting food further.
Using in-between values
The five levels are only convenient stops. If your week clearly falls between two, use a value in the middle:
- 1.3: a desk job with lots of walking (7,000 to 8,000 steps) but no workouts.
- 1.45: a desk job, about 8,000 steps and three gym sessions a week.
- 1.65: an active job plus three or four workouts a week.
The steps calculator works out an implied multiplier from your step count, and the activity level calculator scores your job, steps and workouts. Both are better than a guess.
Find your own multiplier
Once you have a few weeks of data, you can work out your real multiplier:
Your multiplier = measured TDEE ÷ BMR
For example, a 41-year-old woman, 170 cm and 76 kg, has an estimated BMR of 1,457 kcal. She chose lightly active (1.375), but after three weeks of logging, her measured TDEE is 2,330 kcal. Her real multiplier is 2,330 ÷ 1,457 = 1.6, closer to moderately active. She probably walks more than she realised. Measure your own with the adaptive TDEE calculator.
Knowing your real multiplier is useful later: when your weight changes, recalculate BMR and multiply by your own factor instead of guessing again.
What the multiplier includes, and what it doesn’t
It includes your usual exercise. That is the most important point on this page. If you choose moderately active because you train four times a week, then also add the calories your watch says you burned in each session, you count your training twice.
Some apps use a different method: they start from a sedentary base (about 1.2) and add exercise calories each time you log a workout. That works too, but don’t mix the two. Either use an activity multiplier that includes exercise, or a sedentary base plus logged exercise. Our guide on eating back exercise calories explains how to do the second method safely.
The multiplier doesn’t include unusual one-off days, such as a marathon or a day-long hike. On those days you burn far more than your average, and eating more is sensible.
Special cases
- Physical jobs. Count the job. Hard manual work alone often fits very active; add training and you may reach the athlete level.
- Larger bodies. Moving a heavier body costs more energy, which the multiplier captures automatically because it scales with BMR.
- Older adults. The same multipliers apply, but be honest about how much you really move. Many people slow down without noticing.
- Pregnancy, breastfeeding and medical conditions. The standard scale isn’t designed for these. Ask your doctor or midwife.
Activity multiplier questions
Does walking count in the activity multiplier?
Yes. Everyday walking is part of what the multiplier covers, and for many people it matters more than workouts. Lots of daily walking can move you up a level even without exercise.
What multiplier should I use for a physical job?
Usually 1.725 (very active) for hard physical work such as building or farming, and 1.9 if you also train hard. Jobs on your feet with lighter work, such as retail, are usually 1.375 to 1.55.
Should I add exercise calories on top of the multiplier?
No. The multiplier already includes your usual exercise. Only add exercise if you use a sedentary base on purpose, and then add only part of what a watch estimates.
What is the multiplier for sedentary?
1.2. It suits a desk job with little walking and no regular exercise. If you walk a lot but don’t exercise, 1.3 may fit better.
Can I use a multiplier like 1.3 or 1.45?
Yes. The five standard levels are just convenient steps. Use an in-between value if it describes your week better, then check it against your weight trend.
Is 1.2 too low for most people?
For some, yes. Measured data suggest many people with desk jobs burn more like 1.4 to 1.5 times their BMR. The 1.2 factor is a cautious start; if your weight trend shows you burn more, adjust.
Why do some calculators use different multipliers?
There is no single official set. Some calculators use their own descriptions or slightly different numbers, and some follow the higher physical activity levels from FAO/WHO reports. Your own weight trend is the best tiebreaker.
Sources
- FAO, WHO, UNU. Human energy requirements: report of a joint FAO/WHO/UNU expert consultation. FAO Food and Nutrition Technical Report Series 1. Rome: FAO; 2004. www.fao.org/4/y5686e/y5686e00.htm
- Westerterp KR. Physical activity and physical activity induced energy expenditure in humans: measurement, determinants, and effects. Front Physiol. 2013;4:90. doi.org/10.3389/fphys.2013.00090
- Westerterp KR. Diet induced thermogenesis. Nutr Metab (Lond). 2004;1(1):5. doi.org/10.1186/1743-7075-1-5
- Levine JA. Non-exercise activity thermogenesis (NEAT). Best Pract Res Clin Endocrinol Metab. 2002;16(4):679-702. pubmed.ncbi.nlm.nih.gov/12468415/
- Pontzer H, Durazo-Arvizu R, Dugas LR, et al. Constrained total energy expenditure and metabolic adaptation to physical activity in adult humans. Curr Biol. 2016;26(3):410-417. doi.org/10.1016/j.cub.2015.12.046
- Mifflin MD, St Jeor ST, Hill LA, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241-247. doi.org/10.1093/ajcn/51.2.241