The amount of calories burned doing cardio exercise varies depending on the type of cardio exercise, length of time, intensity and weight of a person. According to Mayo Clinic, a person weighing 160 pounds burns 365 calories in one hour doing low-impact aerobics.
If the same person changes the intensity from low-impact to high-impact aerobics, he burns 533 calories in one hour. A person who weighs more also burns more calories. Mayo Clinic lists walking at two miles per hour as the least calorie-burning cardio exercise, while running at eight miles per hour and jumping rope burns the most calories. To maintain good health, spend at least 30 minutes doing cardio exercises every day.