For educational and tracking purposes only. Results are estimates and are not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional.
Calculator tool
How this calculator works
Use the explanation to understand the formula, assumptions, and practical limits behind the calculator result.
What Does the Calories Burned Calculator Do?
This calculator estimates exercise energy use from three inputs: body weight, activity, and duration. It uses MET values, which are standardized activity-intensity estimates used in physical-activity research.
A MET is useful because it lets the calculator compare activities on one scale. Walking, cycling, swimming, and running do not cost the same amount of energy per minute, so the selected activity changes the result even when body weight and duration stay the same.
Activity Values Used by the Calculator
| Activity | MET used |
|---|---|
| Walking | 3.5 |
| Running | 8.0 |
| Cycling | 6.0 |
| Swimming | 6.0 |
| Weight training | 5.0 |
| Yoga | 2.5 |
Formula Used
The calculator uses the standard MET shortcut:
That works because 1 MET is approximately 1 kcal per kilogram per hour. The result is a gross exercise estimate, not a laboratory measurement for a specific person.
Worked Example
For a person who weighs 75 kg and runs for 30 minutes:
So the calculator estimates about 300 kcal burned, with an average burn rate of 10 kcal per minute.
How Should You Read the Result?
Use the result to compare realistic scenarios. For example, keep your body weight and duration fixed, then compare walking with cycling. Or keep the activity fixed and compare 20 minutes with 40 minutes. That shows what is actually moving the estimate.
Do not treat the number as a promise of weight change. Fitness level, pace, terrain, technique, rest periods, and wearable-device assumptions can all move the real value away from the estimate.
Common Mistakes to Avoid
- Comparing unlike activities by time alone. Thirty minutes of yoga and thirty minutes of running do not represent the same workload.
- Treating the estimate as net calories. This calculator shows gross activity calories, not calories above resting metabolism.
- Ignoring intensity inside an activity label. A slow jog and a hard run can have different MET values even though both are called running.
- Using calorie burn alone to judge a training plan. For training quality, also compare pace, heart-rate zone, and recovery.
Frequently asked questions
Why does body weight change the calorie estimate?
MET calculations scale with body mass. Moving a heavier body usually requires more energy for the same activity and duration, so two people doing the same workout can receive different estimates.
Why might my watch show a different number?
Wearables may use heart rate, accelerometer data, GPS, age, sex, and their own proprietary assumptions. This calculator uses only the selected MET value, weight, and time, so it is better for transparent comparison than for pretending to measure exact personal expenditure.
Is intensity or duration more important?
Both matter. Duration scales the result directly, while intensity changes the MET value itself. If one workout has twice the MET value, it burns roughly twice as many calories per minute before duration is even considered.
Should I use this calculator for weight-loss decisions?
Use it as one planning input, not as the whole decision. Pair it with the calorie calculator or TDEE calculator, and keep in mind that food intake, recovery, and long-term consistency usually matter more than a single workout estimate.
