MET Calorie Burn Calculator — Any Activity

MET Calculator Guide

What Is MET?

MET (Metabolic Equivalent of Task) is the ratio of metabolic rate during an activity to resting metabolic rate. MET = 1.0 = resting. MET = 2.0 = twice resting energy expenditure. Calorie formula: kcal = MET × weight (kg) × duration (hours). Example: running at MET 10 for 30 minutes at 70kg: kcal = 10 × 70 × 0.5 = 350 kcal. MET values are taken from the Compendium of Physical Activities (Ainsworth et al.) — the standard reference used in exercise science research. For net calories burned during exercise, excluding what you'd burn anyway at rest, subtract 1 MET from the activity's value before calculating.

What's the key thing to understand about MET Values for Common Activities?

Sedentary (MET 1-1.5): sleeping, watching TV, light desk work. Light (MET 1.5-3): slow walking, standing, light housework. Moderate (MET 3-6): brisk walking, cycling at leisure, yoga, golf, doubles tennis, gardening. Vigorous (MET 6-9): jogging, swimming laps, aerobics classes, weight training, cycling at pace. Very vigorous (MET 9+): running at race pace, competitive cycling, rowing hard, competitive sports. Physical activity guidelines: 150 min/week moderate (MET 3-6) or 75 min/week vigorous (MET 6+) activity is the baseline recommendation for general health.

What's the key thing to understand about Accuracy Limitations?

MET values are population averages — individual variation is significant. Factors not captured: fitness level (trained athletes burn fewer calories at the same pace because they are more efficient). Body composition (more muscle increases BMR and calorie burn at any MET). Heat and humidity (increase energy expenditure). Terrain (uphill running is not the same MET as flat running). Heart rate monitoring: a heart rate monitor gives a more personalised estimate than MET — though even HR-based estimates can be thrown off by medication, caffeine, heat, or stress.

What's the key thing to understand about Comparing Activities by Calorie Efficiency?

Most calories per minute (vigorous activities at 75kg): running 12 km/h: 15 kcal/min. Rowing machine (vigorous): 11.3 kcal/min. Cycling fast: 13.8 kcal/min. Swimming laps (vigorous): 10 kcal/min. Most sustainable calorie burn (moderate intensity, sustainable for 60+ min): cycling at 20 km/h: 7.5 kcal/min × 60 min = 450 kcal. Brisk walking: 4.4 kcal/min × 60 min = 264 kcal. The 'best' exercise for calorie burn is whichever one you will actually do consistently. High-intensity exercise burns more calories per minute, but a lower-intensity activity you can sustain for much longer often burns comparable or more total calories over a full session.

Where Do MET Values Come From?

MET (Metabolic Equivalent of Task) values originate from the Compendium of Physical Activities, a research database maintained by exercise scientists that assigns a MET value to hundreds of specific activities based on measured oxygen consumption during that activity in study participants. One MET represents resting energy expenditure (roughly 3.5ml of oxygen consumed per kg of bodyweight per minute), so an activity rated at 6 METs is estimated to use six times the energy of sitting quietly. Because the underlying research used specific populations, intensities, and conditions (a 'MET 8.0 running' entry assumes a particular pace), real-world MET-based calorie estimates are an average approximation rather than a measurement of the individual doing the activity, which is why two calculators using the same MET table can still differ slightly if they round bodyweight or duration differently.

Why MET-Based Estimates Can Overstate Calorie Burn for Trained Individuals?

MET values are generally derived from studies of moderately fit, untrained-to-recreationally-active participants, and a well-trained individual performing the same activity at the same apparent intensity typically expends somewhat fewer calories because trained muscle and cardiovascular systems work more efficiently per unit of output — the same phenomenon that makes an experienced runner's heart rate lower than a beginner's at the same pace. This means MET-based calculators tend to be reasonably accurate for an average, moderately active person but can overstate calorie burn by perhaps 5-15% for highly trained athletes performing familiar activities, and can understate it for very unfit or overweight individuals, whose bodies work harder than the reference population to perform the same task. This is one of several reasons MET-based tools are best treated as a planning estimate rather than a precise energy-expenditure measurement.

Why Does Your Fitness Level Change the True Calorie Cost of the Same Activity?

MET tables are built from average measurements across groups of people, so they assume a "standard" response to an activity. In reality, a well-trained person often burns somewhat fewer calories doing the same activity at the same MET-rated intensity than an untrained person, because their body has become more mechanically and metabolically efficient at that movement — the same reason trained runners have lower oxygen cost per mile than beginners at the same pace. Conversely, someone who is overweight or carrying more mass generally burns more total calories doing the same activity, because MET values describe energy cost relative to bodyweight, and moving more mass costs more absolute energy even though the MET value itself stays constant. This is why two people of very different weights doing an identical cardio class get different calorie totals from the same calculator, and why the same person's calorie burn per session tends to drift down slightly over months of consistent training at a fixed MET level, even though the workout feels just as hard. None of this makes MET estimates useless — they're still the most practical general-purpose tool available outside a lab — but it explains why MET-based numbers should be treated as a reasonable estimate for planning a deficit or surplus, not a precise account of a single individual's exact energy expenditure.

Worked Example: Comparing Two Activities by MET Value

A 68kg person doing 45 minutes of moderate cycling (MET 6.0) burns calories = MET x weight(kg) x duration(hours) = 6.0 x 68 x 0.75 = 306 kcal. The same person doing 45 minutes of vigorous swimming (freestyle, MET 8.0) burns 8.0 x 68 x 0.75 = 408 kcal — a difference of 102 kcal driven entirely by the higher MET value of swimming at that intensity. This formula is the basis for every MET-based estimate on this site, and its main limitation is that MET values are drawn from population averages (the Compendium of Physical Activities), so a highly trained athlete typically burns somewhat fewer calories than the formula suggests for a given activity, because they move more efficiently.

MET Value Reference Table for Common Activities

These figures come from the Compendium of Physical Activities, the standard academic reference most fitness trackers and calculators draw from, and represent averages across many individuals rather than a precise value for any one person's efficiency or fitness level.

Where MET Values Come From

MET (Metabolic Equivalent of Task) values originate from the Compendium of Physical Activities, maintained by exercise scientists and periodically updated, which assigns a MET value to hundreds of specific activities based on measured oxygen consumption during that activity in research studies. One MET represents resting metabolic rate (roughly 3.5ml of oxygen per kg of bodyweight per minute); an activity at 6 METs uses roughly six times the oxygen, and therefore burns roughly six times the calories, of sitting quietly.

MET-Minutes and the WHO Physical Activity Guidelines

The World Health Organization's global physical activity guidelines are built directly on the MET system used throughout this calculator. WHO recommends adults get at least 150 to 300 minutes of moderate-intensity activity, roughly 3 to 5.9 METs, or 75 to 150 minutes of vigorous-intensity activity, roughly 6 METs and above, each week, or an equivalent combination of the two. Converting this into MET-minutes, a way of combining intensity and duration into one number, gives a rough weekly target of around 500 to 1,000 MET-minutes. This is useful for comparing very different types of activity on equal terms: thirty minutes of brisk walking at roughly 3.5 METs contributes about 105 MET-minutes, while the same thirty minutes of running at roughly 9.8 METs contributes nearly three times as much, around 294 MET-minutes, toward the same weekly target. Thinking in MET-minutes rather than just activity minutes is one way to see why mixing some vigorous activity into a week can reach the recommended weekly amount in considerably less total exercise time than moderate activity alone would need.