How many calories are burnt in a marathon?

On average, when doing cardiovascular exercise you tend to burn about 100 calories every 10 minutes. Likewise when running on the treadmill at a 5.5 MPH rate, you will burn about 100 calories per mile. If you run faster than that, which most marathon runners do, you will obviously burn more calories per mile. But if a 5.5 MPH rate is held for 26 miles, than the runner will burn 2,600 calories.