An 8-mile walk can result in a calorie burn of between 640 and 1,008 depending on weight and pace. A 140-pound person can burn 200 calories per hour while walking at a pace of 4.5 mph, according to Prevention.
The majority of people start out walking a mile in 20 minutes, but over time they may acquire an athletic 12-minute mile pace to burn more calories. The heart consumes oxygen, a vital component in the body’s calorie-burning process, more quickly the faster a person walks.
A person can cover more ground in a shorter amount of time by walking at a faster pace. According to SparkPeople, the precise calculation of calories burned is based on a person’s weight and the amount of time they spend walking at a particular pace. To find the number of calories expended for a certain weight range, use an online calorie calculator.
If a person walks at a pace of 4 mph, an 8-mile walk typically takes two hours to complete. This results in a 15-minute mile pace for a 200-pound person and a significant reduction in calories burned compared to a 20-minute mile pace.
A 200-pound person walks 8 miles at a pace of 15 minutes per mile and burns 864 calories in two hours. This same person requires an additional 40 minutes to finish an 8-mile walking workout at a steady rate of 20 minutes per mile, which results in only 624 calories being burned in two hours.