Solve for MET value, calories, activity duration, or body weight with a consistent metabolic-equivalent equation and clear unit conversions.
METs, Calories, and Oxygen Cost
One metabolic equivalent (1 MET) represents a conventional resting oxygen cost of 3.5 milliliters of oxygen per kilogram per minute. Activity MET values scale that reference and can be combined with body weight and duration to estimate gross energy expenditure.
Formula and Method
Calories = MET x 3.5 x body weight in kilograms x minutes / 200. The calculator rearranges this equation when solving for MET value, duration, or body weight.
Example MET intensity groupings
| Reference | Range or value | Use or interpretation |
|---|---|---|
| Light | Below 3 METs | Easy daily activity |
| Moderate | 3 to 5.9 METs | Brisk walking and similar work |
| Vigorous | 6 METs or more | Running and other demanding work |
| 1 MET reference | 3.5 mL O2/kg/min | Conventional resting value |
How to Use the Result
Select a representative activity or enter a manual MET value. Use the actual active duration and body weight unit shown beside the input. When solving backward, remember that the result inherits the uncertainty of the MET estimate.
Assumptions and Limitations
Compendium MET values are population estimates. Technique, fitness, body composition, grade, equipment, temperature, and efficiency can change actual energy use. The equation estimates gross calories and should not be treated as a direct metabolic measurement.
Sources
- Ainsworth BE and colleagues. Compendium of Physical Activities, current edition.