most helpful answer that would depend on several other factors like the type of stroke. for instance a butterfly would burn up more calories than freestyle. speed would be another factor -- you burn off more if you are being chased by a shark than a leisurely swim. the calorie expenditure also changes when you get in better shape. a bad swimmer likely burns off more calories than someone who has a perfect stroke. a round figure could be around 400 kcal but that is a very rough estimate.
how many calories are burned when swimming a mile? . a mile at a moderate speed. i am 225lbs and female