New How Many Calories Does A Marathon Burn Background. Because nutritional needs and energy demands are high, runners should strive for balanced, nutritious diets in order to improve performance and endurance. Well, exact calorie burn will vary from person to person, but a ballpark estimate from the folks at medifast puts the burn rate at about 100 calories per a mile.
The average estimate is 100 calories per mile.
If you're asking this because you are planning nutrition for an upcoming marathon, it's important to know that 1. Using about a liter of oxygen translates to five calories of energy. You'd need to walk 27 minutes to burn 96 calories. You do burn a lot of calories after exercising, at least if you exercise at an intensity roughly equal to 70 percent of your vo2 max.