While calories burned during swimming vary due to the intensity of exercise and weight of the swimmer, the average calories the sport requires per hour is between 423 and 632, according to Mayo Clinic. To lose a pound of fat, an individual must burn 3,500 more calories than he consumes.
According to Mayo Clinic, most people need about 150 minutes of moderate aerobic activity, such as swimming, per week. It is acceptable to break the exercise sessions into increments as small as 10 minutes. Mayo Clinic also recommends strength training at least twice per week, giving a general goal of a minimum of 30 minutes of exercise daily.
The number of calories burned swimming varies based on sex, body weight and the amount of time spent swimming. A 140-lb. female burns 580 calories per hour swimming, while a 175-lb. man burns 730 calories per hour swimming, notes MedicineNet.
Swimming is a strenuous activity that burns the same amount of calories as playing football or jogging a 9-minute mile, states MedicineNet. To calculate the exact number burned, an individual must divided body weight by either 140 or 175, based on sex, and then multiply this number by the number of calories burned for that weight. This gives the approximate number of calories the individual burns while swimming.