Walking 8 miles burns roughly 600 to 1,000 calories for most people, depending primarily on your body weight and walking speed. A 155-pound person walking at a moderate pace of 3 mph will burn approximately 710 calories over the full distance, while a 200-pound person at the same pace burns closer to 920 calories. That’s a significant chunk of daily energy expenditure from a single activity.
Calories Burned by Weight and Pace
Two factors matter most in this calculation: how much you weigh and how fast you walk. Heavier bodies require more energy to move over the same distance, and faster paces demand more oxygen per minute. Exercise scientists use a unit called MET (metabolic equivalent of task) to quantify the intensity of different walking speeds. A moderate walk at 3 mph clocks in at 3.8 METs, a brisk 3.5 mph pace hits 4.8 METs, and a very brisk 4 mph walk reaches 5.5 METs.
Here’s what 8 miles looks like across different body weights and speeds:
- 130 lbs (59 kg): ~600 calories at moderate pace, ~650 at brisk pace, ~650 at very brisk pace
- 155 lbs (70 kg): ~710 calories at moderate pace, ~770 at brisk pace, ~775 at very brisk pace
- 180 lbs (82 kg): ~830 calories at moderate pace, ~895 at brisk pace, ~900 at very brisk pace
- 200 lbs (91 kg): ~920 calories at moderate pace, ~1,000 at brisk pace, ~1,000 at very brisk pace
You’ll notice something interesting: at higher speeds, the per-minute burn rate increases, but you also finish the 8 miles faster. These two effects partially cancel each other out, which is why the calorie totals for brisk and very brisk paces are closer together than you might expect. The biggest variable isn’t pace. It’s body weight.
How Long 8 Miles Actually Takes
Eight miles is a serious time commitment on foot. At a relaxed 3 mph pace, you’re looking at about 2 hours and 40 minutes. A moderate 4 mph pace cuts that to 2 hours. If you push to a fast walk of roughly 4.5 mph (close to a slow jog for some people), you can finish in about 1 hour and 28 minutes.
Most people walking for exercise settle into a pace between 3 and 3.5 mph, which puts the total time somewhere around 2 to 2.5 hours. That duration matters not just for scheduling but also for how your body fuels the effort.
What Your Body Burns During a Long Walk
During shorter or more intense exercise, your muscles rely heavily on glycogen, the stored carbohydrate in your muscles and liver. Walking at a moderate pace is low-intensity enough that your body doesn’t need that fast-burning fuel as urgently. As the walk stretches past the first 30 to 60 minutes and glycogen stores start to dip, your body increasingly taps into fat as a fuel source.
This is why long walks have a reputation as effective fat-burning exercise. The total calorie number may be lower per minute compared to running, but a larger proportion of those calories come from fat. Over 8 miles and two-plus hours of walking, that adds up to meaningful fat oxidation. The tradeoff is straightforward: you burn fewer calories per minute than a runner, but you’re spending a lot more minutes on the road.
Walking 8 Miles vs. Running 8 Miles
Running the same 8-mile distance burns more total calories, typically around 30% more. Some estimates put it closer to double the calorie burn per minute, but since runners cover the distance in less time, the gap narrows when you compare the same distance rather than the same duration. A 155-pound person running 8 miles at a moderate jogging pace would burn roughly 900 to 1,000 calories, compared to about 710 to 775 walking.
The calorie gap narrows further for heavier individuals, since body weight drives a larger share of the energy cost when you’re walking. Walking also produces far less joint impact, making it sustainable for people who can’t tolerate the pounding of an 8-mile run. For pure calorie burn per hour, running wins. For something you can realistically do multiple times a week without injury, walking has an edge.
How Hills Change the Numbers
Walking on flat ground and walking uphill are very different workouts. Research on incline walking found that a 10% gradient increased metabolic energy cost by about 23% compared to flat ground, and a 16% gradient boosted it by 44%. If your 8-mile route includes significant hills, your actual calorie burn could be substantially higher than the flat-ground estimates above.
For context, a 10% grade is steep enough that you’d notice it immediately. Most outdoor walking routes with rolling hills average somewhere between 2% and 5% grade on the uphill portions. Even that moderate elevation change adds meaningfully to total burn, especially over 8 miles. If you’re walking on a treadmill, setting even a 2 to 3% incline makes the workout more closely resemble outdoor walking, where terrain is rarely perfectly flat.
After-Burn Effect for Walking
After any exercise, your body continues consuming extra oxygen as it recovers, a phenomenon called excess post-exercise oxygen consumption, or EPOC. For steady-pace walking, this after-burn is modest. One study comparing continuous walking to interval walking (alternating 3 minutes of fast walking with 3 minutes of slow walking) found that interval walking more than doubled the post-exercise oxygen consumption: 8.4 liters versus 3.7 liters for continuous walking.
In practical terms, the after-burn from a steady 8-mile walk adds a small bonus, perhaps 30 to 50 extra calories over the hours following your walk. If you want to increase that effect without running, mixing in bursts of faster walking throughout your route is a simple way to do it.
Step Count for 8 Miles
The average person takes between 2,000 and 2,500 steps per mile while walking. Over 8 miles, that works out to roughly 16,000 to 20,000 steps. Your exact count depends on stride length, which averages about 2.5 feet for men and 2.2 feet for women, though height is the bigger determinant. Taller people take fewer steps per mile, shorter people take more.
If you’re tracking steps with a fitness band or phone, 8 miles will likely land you well above the commonly cited 10,000-step daily target. For people using step counts as their primary fitness metric, an 8-mile walk essentially doubles a normal day’s goal in a single session.