It depends on a whole lot of factors... such as how long it takes you, what stroke you use. I swim 1km three or four times a week - and it takes me about 25-30 minutes and I do mostly freestyle. I log my swims at a swimming for fitness website and it calculates roughly my calorie usage. For me, a 1km uses about 220-230 calories. If I combine it with a bike ride to and from the pool (4km total) it burns an extra 150 calories. Keep on swimming :)
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