Running burns calories with every step, and burning calories is an important part of losing weight. How many calories you burn while running varies according to a number of factors.
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Although factors ranging from temperature to stress level can effect your calorie burn, fitness coach Ben Cohn reports that two factors have the strongest effect on calorie burn: body weight and level of exertion.
The faster you run, the more calories you burn. A 150-pound person burns 119 calories running a mile in 9 minutes. Running that mile in 6 minutes burns 178 calories. Running one 12-minute mile burns 115 calories.
The more you weigh, the more you carry around with you and the more calories you burn in every activity. Running a 9-minute mile, a 150-pound person burns 119 calories. Running the same distance at the same pace, a 130-pound person burns only 103 calories. A 200-pound runner burns off 158 calories doing the same workout.