It depends on how fast you swim and how much you exert yourself. You can burn about 900 calories an hour just sitting/walking around in the pool so if you take a long time doing laps you'll burn a lot more.
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You lose anywhere from six to twelve calories every 50 you do longcourse, so you would lose anywhere from 300 to 600 calories, or maybe even more, depending on your stroke and speed. hope this estimation helps :)
A 55 kilo person swimming 25 laps in one hour would burn 479 calories. The number of calories is primarily based on weight and pace.
It depends how fast you swim, what stroke, how hard you are working and your size.
It can depend on age, height and weight but on average 50 lengths of breast stroke burns approximately 400 - 500 calories in a 25 metre pool.