Calories Burned by Activity

Why one table doesn't fit everyone

Nearly every calorie-burn calculator online applies a single adult MET table to every user, then runs the same textbook formula. That is convenient, and for a large slice of the population it is also wrong.

The reason is the reference point. A MET expresses activity intensity as a multiple of resting metabolism, and the standard tables fix that resting rate at 3.5 ml of oxygen per kilogram per minute. That figure came from a 70 kg, 40-year-old man. Most people are not him.

The Compendium now publishes four separate reference sets, and this calculator picks the right one automatically:

Why the personalised number can come out higher

This surprises people, so it is worth explaining properly.

A MET is not an absolute quantity of energy. It is a ratio — how hard an activity is relative to your own resting metabolism. The standard tables fix that denominator at 3.5 ml/kg/min, the resting rate of a 70 kg, 40-year-old man.

Most people rest below that. A 45-year-old man of 80 kg, for instance, works out at roughly 2.97 ml/kg/min. His resting burn per hour is genuinely lower than the young reference male's. But that is precisely why a task rated at 3 METs is harder relative work for him: the same absolute effort represents a larger multiple of his own baseline. The corrected MET scales up to reflect that, and the calorie figure follows.

So the correction is not claiming he burns more energy than physics allows. It is saying that the standard table, built around someone else's baseline, misrepresents what that activity costs this body. Which way the correction moves depends entirely on whether your resting rate sits below or above 3.5 — the calculator shows you yours, alongside the generic figure, every time.

The arithmetic

Each population uses its own equation, taken from the Compendium's official calculator workbook:

• Adults 18–59: corrected MET = standard MET × (3.5 ÷ your RMR in ml/kg/min), where RMR comes from the Harris-Benedict equation. Calories = corrected MET × kg × hours.
• Older adults 60+: calories/min = (MET60 × 2.7 × kg) ÷ 200.
• Wheelchair users: calories = METwc × 0.992 × kg × hours.
• Youth: METy is already a multiple of the child's own resting rate, so calories/min = METy × (RMR ÷ 1440), with RMR from the Schofield equations.

A worked example

A 52-year-old woman, 168 cm, 76 kg, walking briskly at 3.5 mph — a standard 4.3 METs — for 30 minutes:

Harris-Benedict RMR	1,450 kcal/day
… converted to ml·kg⁻¹·min⁻¹	2.65
Corrected MET = 4.3 × (3.5 ÷ 2.65)	5.68
kcal/min = (5.68 × 76) ÷ 60	7.20
30 minutes	216 kcal

A generic calculator using the same 4.3 METs would say about 172 kcal. The difference is the whole point of the correction, and the direction surprises people: her estimated resting rate is 2.65 ml·kg⁻¹·min⁻¹, not the 3.5 the standard tables assume. Relative to her own resting metabolism the walk is harder work than 4.3 METs implies, so the corrected figure is higher, not lower. The Compendium’s own analysis found the standard 3.5 referent understates measured MET values about 89% of the time, with the largest gaps in exactly the groups most likely to be using a calculator like this one: women, older adults, heavier people and the less fit.

Why the numbers disappoint — and why it doesn't matter

Most people substantially overestimate what exercise burns. Run any realistic session through this calculator and the arithmetic rarely justifies the slice of cake. The human body is remarkably efficient: compare energy per passenger-mile, and a bicycle needs about 35 calories where a car burns roughly 1,860.

The honest conclusion is that you cannot reliably outrun your fork. If weight loss is the goal, what you eat does most of the work — which is what the nutrition tracker and the metabolic rate calculator are for.

But calorie burn is close to the least valuable thing exercise does. Regular activity raises aerobic capacity — true even in established heart disease, where it lowers the oxygen demand on the heart muscle itself. It is one of the few reliable ways to raise HDL cholesterol. It improves insulin sensitivity substantially, which is why it is a cornerstone of type 2 diabetes remission and why many people can reduce medication with consistent activity. It protects bone and lowers colon cancer risk. And it is the strongest single predictor of keeping weight off once it is lost. Diet takes the weight off; activity is what stops it coming back.

Questions people actually ask about this

How many calories does walking burn?

Brisk walking at 3.5 mph is 4.3 METs. For a 76 kg, 52-year-old woman that works out at roughly 216 calories in 30 minutes once the MET value is corrected to her own resting metabolic rate — a generic calculator using one table for everyone would say about 172. Your own figure depends on your weight, age, sex and height, which is what the calculator above adjusts for.

How are calories burned calculated?

From MET values — the energy cost of an activity expressed as a multiple of resting metabolism — published in the Compendium of Physical Activities. This calculator then corrects the standard MET to your own estimated resting rate rather than assuming the textbook 3.5 ml/kg/min, using the method the Compendium publishes for exactly that purpose.

Are calories burned figures from watches and machines accurate?

Treadmills and wrist trackers routinely overestimate, often substantially. Machines frequently ignore your weight and efficiency, and wrist devices infer effort from heart rate and movement rather than measuring oxygen consumption. Any figure from any source, this page included, is an estimate with real error attached.

What is a MET?

One MET is the energy you use sitting quietly. An activity of 4 METs costs about four times that. The convention sets 1 MET at 3.5 ml of oxygen per kilogram per minute, which is a population average rather than a fact about you — and correcting for that difference is the main thing this calculator does that most others do not.

Why does this give a different answer from other calorie calculators?

Two reasons. Most calculators apply a single adult MET table to everyone, including children, older adults and wheelchair users, who have genuinely different reference metabolisms. And most assume the standard 3.5 ml/kg/min resting rate rather than estimating yours, which the Compendium found understates the true MET value about 89% of the time.

Does the calorie burn include what I would have burned anyway?

Yes — these are gross calories, not net. You would have burned roughly one MET-worth of energy sitting on the sofa for the same period, so the extra cost of the activity is lower than the headline number. If you are eating back exercise calories, that difference matters and is one more reason not to.

Why is exercise disappointing for weight loss?

Because the numbers are smaller than people expect and easily undone: 30 minutes of brisk walking is roughly one modest snack. Appetite and unconscious movement also adjust to compensate. Exercise is a poor lever for weight loss and an excellent one for blood pressure, insulin sensitivity, mood, sleep and long-term mortality — judge it on those.

Which activities burn the most calories?

Per minute, running, swimming hard, cycling fast and cross-country skiing sit at the top, generally 8 to 14 METs. But total burn is intensity multiplied by duration, and most people sustain moderate activity far longer than vigorous. An hour of brisk walking usually beats ten minutes of running.

References & data sources

Every MET value on this page comes directly from the published Compendium datasets, downloaded from the sources below.

1. Herrmann SD, Willis EA, Ainsworth BE, et al. 2024 Adult Compendium of Physical Activities: A third update of the energy costs of human activities. J Sport Health Sci. 2024;13(1):6–12. doi:10.1016/j.jshs.2023.10.010 1,097 adult activities, and the corrected-MET method used for ages 18–59.
2. Willis EA, Herrmann SD, Hastert M, et al. Older Adult Compendium of Physical Activities: Energy costs of human activities in adults aged 60 and older. J Sport Health Sci. 2024;13(1):13–17. doi:10.1016/j.jshs.2023.10.007 98 activities measured in adults over 60, referenced to 2.7 ml/kg/min.
3. Conger SA, Herrmann SD, Willis EA, et al. 2024 Wheelchair Compendium of Physical Activities: An update of activity codes and energy expenditure values. J Sport Health Sci. 2024;13(1):18–23. doi:10.1016/j.jshs.2023.10.008 124 activities measured in adult wheelchair users, referenced to 0.992 kcal/kg/hr.
4. Butte NF, Watson KB, Ridley K, et al. A Youth Compendium of Physical Activities: Activity codes and metabolic intensities. Med Sci Sports Exerc. 2018;50(2):246–256. doi:10.1249/MSS.0000000000001430 196 activities with separate METy values for ages 6–9, 10–12, 13–15 and 16–18.
5. Compendium of Physical Activities — official website and downloadable datasets. Arizona State University. pacompendium.com Source of the adult, older adult, and wheelchair datasets and the official calculator workbook used here.
6. National Collaborative on Childhood Obesity Research. Youth Compendium of Physical Activities. nccor.org/tools-youthcompendium Source of the Youth Compendium dataset used for users under 18.
7. Kozey S, Lyden K, Howe CA, Staudenmayer JW, Freedson PS. Errors in MET estimates of physical activities using 3.5 mL·kg⁻¹·min⁻¹ as the baseline oxygen consumption. J Phys Act Health. 2010;7(4):508–516. doi:10.1123/jpah.7.4.508 Demonstrates the error introduced by assuming a 3.5 ml/kg/min baseline for everyone, and underpins the corrected-MET method used here for adults aged 18–59.
8. Schofield WN. Predicting basal metabolic rate, new standards and review of previous work. Hum Nutr Clin Nutr. 1985;39 Suppl 1:5–41. The resting metabolic rate equations used for children and adolescents.
9. U.S. Department of Health and Human Services. Physical Activity Guidelines for Americans. 2nd ed. Washington, DC; 2018. health.gov Basis for the health benefits described above.