How many calories are burnt swimming?

The amount of calories burnt when swimming for 30 minutes is relative to body type, sex and metabolism, as well as the intensity of the exercise. However, for a woman of average weight and size, 30 minutes of swimming should burn 285 calories for back stroke, 273 for breast stroke, 261 for fast crawl, 285 for slow crawl, 204 for side stroke, and 105 for treading water. These figures are based on an average weight of 123lb. In comparison, a man weighing an average of 170lb, would receive the following calorie results: 390 for back stroke, 375 for breast stroke, 360 for fast crawl, 390 for slow crawl, 270 for side stroke and 144 for treading water.