This is why you should use a calorie counter regularly. 375 1,910 calories per day How Many Calories Should You Eat to Lose Weight.  &0183;&32;The average adult burns approximately 2000 calories per day. 9. 30. How much calories burn in 30 minutes exercise That said, according to the American Council on Exercise, here is the number of calories that someone who weighs 150 pounds would burn doing the following exercises 30 minutes walking (moderate pace) 112 calories.  &0183;&32;The men in the outdoor school burned an average of 3,822 calories per day while hiking in the mountains during the spring and 4,787 calories per day in winter; for women it was 3,081 in spring and.