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The answer will depend somewhat on your body weight and the length and intensity of your workout or event.
So, as an example, if you're riding your mountain bike for around 2 hours at a brisk pace and averaging around 20 km/h, how many calories would you use?
Most heart rate monitors give a pretty good estimate of this. There are so many factors involved--the temperature outside, for instance. This chart can give you a pretty good idea, but it will vary so much for each individual. If you're interested in this sort of thing, I would suggest getting a heart rate monitor.
ACSM Personal Trainer
AKC Kettlebell Instructor
I'll weigh in as a swimmer.
You burn 2.12 calories for every pound per mile. In other words, a 100 pound person swimming a mile would burn 212 calories.
Looks like I could up my calorie intake then.