Measuring calorie burn precisely requires laboratory equipment, but MET values offer a practical estimate from three inputs: the activity's intensity, your body weight, and the time spent exercising.
The result is most useful for comparing activities and understanding their approximate energy cost. Treat it as a range, not a precise measurement.
What Is a MET Value?
MET stands for Metabolic Equivalent of Task. One MET represents the conventional energy cost of rest. An activity rated at 5 METs is estimated to use about five times as much energy per minute as resting.
The 2024 Adult Compendium of Physical Activities assigns standard MET values to 1,114 activities. Values vary with pace, resistance, terrain, technique, and other details, so the same general activity can cover a wide range.
How to Calculate Calories Burned with MET Values
The Compendium's unit-conversion guidance defines 1 MET as 3.5 milliliters of oxygen per kilogram of body weight per minute. Its oxygen-based conversion to kilocalories is:
The same formula can be written more compactly:
One kilocalorie is one Calorie in everyday nutrition language. Convert pounds to kilograms before using either formula:
You may also see the simpler shortcut below. It comes from rounding 1 MET to approximately 1 kilocalorie per kilogram per hour, so it produces a result about 5% lower than the oxygen-based formula. Both are conventional estimates; use one consistently when comparing results.
MET Calorie Calculation Example
Suppose a person weighing 70 kg completes 30 minutes of an activity rated at 8 METs:
The estimated total energy expenditure is 294 Calories. If the appropriate MET value could reasonably be between 6 and 10, the estimate becomes a more honest range of about 221-368 Calories.
Calories Burned in 30 Minutes by MET Value
The table uses the oxygen-based formula to estimate total Calories at 3, 6, and 9 METs. Actual activity intensity does not always fit neatly into these examples.
| Body weight | 3 METs | 6 METs | 9 METs |
|---|---|---|---|
| 50 kg (110 lb) | 79 Cal | 158 Cal | 236 Cal |
| 60 kg (132 lb) | 95 Cal | 189 Cal | 284 Cal |
| 70 kg (154 lb) | 110 Cal | 221 Cal | 331 Cal |
| 80 kg (176 lb) | 126 Cal | 252 Cal | 378 Cal |
| 90 kg (198 lb) | 142 Cal | 284 Cal | 425 Cal |
| 100 kg (220 lb) | 158 Cal | 315 Cal | 473 Cal |
Total Calories vs Active Calories
The formula above estimates total, or gross, energy expenditure during the time period. That includes energy your body would have used at rest. Some apps instead display active Calories, which attempt to exclude this resting portion. Using the same oxygen-based conversion:
In the 8-MET example, this produces about 257 active Calories instead of 294 total Calories. Devices may use different definitions and personalized models, so their results do not need to match this estimate.
How to Choose the Right MET Value
Use the value that most closely matches what you actually did. Pace and effort matter more than the activity name alone: a gentle ride and a hard cycling interval session should not use the same estimate.
You can find typical MET ranges for each Activity Type on its dedicated detail page. Pick a value toward the lower or upper end according to the session, or calculate both ends and keep the result as a range.
How Accurate Are MET Calorie Estimates?
A standard MET assumes the same resting energy cost for everyone. In reality, resting metabolism and exercise efficiency vary with body composition, age, fitness, movement economy, environment, and individual physiology.
In a study of 769 adults, the conventional 1-MET baseline overestimated measured resting oxygen use by 35% and resting energy expenditure by 20% on average. That does not mean every activity estimate is high by the same percentage, but it shows why a standard MET cannot be an exact personal measurement.
MET tables describe representative activities, not your exact workout. Body weight and time can also be measured imperfectly, while pauses or changing intensity make a single MET value less representative.
How to Use a MET Calorie Estimate
- Prefer a range over a single exact number.
- Compare the approximate energy cost of different activities.
- Use the same method when comparing similar workouts over time.
- Do not treat estimated Calories as an exact amount of food earned or required.
- Use indirect calorimetry when a precise laboratory measurement genuinely matters.
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