everyone is different. it depends on how fit you are, how good at swimming you are, & how long it takes for you to complete 100 yds. some people take less than a minute and other people can't swim 100 yds without stopping to rest.
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The number of calories burned depends on the swimmer's weight and the speed of swimming. A 180 pound person who swims 700 yards in an hour will burn 500 calories.
Assuming that you are swimming front crawl / breast stroke at an average rate in a 25m pool - approx 700 cal's.