Running a 10k (6.2 miles) burns roughly 600 to 700 calories for most people, but the actual number ranges from about 450 to over 900 depending primarily on your body weight. A widely used rule of thumb puts the cost at about 100 calories per mile, which gives a baseline of around 620 calories for the full distance. That estimate works reasonably well for a person weighing around 150 pounds, but it shifts significantly in either direction as weight changes.
Calorie Burn by Body Weight
Your body weight is the single biggest factor in how many calories you burn over 6.2 miles. Moving a heavier body the same distance simply requires more energy. Here’s what the numbers look like at a moderate running pace:
- 120 lbs: approximately 450 to 500 calories
- 150 lbs: approximately 600 to 650 calories
- 180 lbs: approximately 720 to 780 calories
- 210 lbs: approximately 850 to 920 calories
For every 30 pounds of additional body weight, you can expect to burn roughly 150 more calories over the full 10k distance. This is the variable that matters most. If you’ve seen a flat “a 10k burns 600 calories” claim elsewhere, it was probably calculated for someone in the 150-pound range.
Does Running Faster Burn More Calories?
This is one of the most common misconceptions about running. Speed has a surprisingly small effect on total calories burned over a fixed distance. A 10-minute-per-mile pace and an 8-minute-per-mile pace burn nearly the same number of calories over 6.2 miles. The faster runner finishes sooner, but their per-minute burn rate is higher, so it roughly evens out.
The standard measure of exercise intensity, called a MET value, does increase with speed. Running at a 10-minute mile pace scores a 9.3, a 9-minute mile comes in at 10.5, and an 8-minute mile reaches 11.8. But because a faster runner spends fewer minutes on the course, the total energy cost per mile stays relatively stable. Daniel Vigil, an associate clinical professor at UCLA’s medical school, describes calories per mile as “a fairly stable number, regardless of how fast you run.”
Where speed does make a small difference is at the extremes. Sprinting an entire 10k (which almost nobody does) would burn somewhat more due to the inefficiency of all-out effort. And very slow jogging starts to blend with walking, which changes the biomechanics entirely.
Walking a 10k vs. Running It
If you walk a 10k instead of running it, you’ll still burn a meaningful number of calories, though the total will be lower. Walking a mile burns roughly 60 to 80 calories for most people compared to the ~100 calories per mile from running, putting a walked 10k somewhere in the 370 to 500 calorie range depending on weight.
Interestingly, research published in the Journal of Sports Medicine and Physical Fitness found that at the crossover point, where someone is moving at about 5 miles per hour, walking actually burns at least as much energy as jogging at the same speed. That’s because 5 mph is an awkward, inefficient speed for walking. Your body naturally wants to break into a jog at that pace, and forcing yourself to walk requires extra muscular effort. Below that crossover speed, though, running is the more calorie-expensive option mile for mile.
How Terrain Changes the Math
Running on hills can push your calorie burn well above the flat-ground estimates. Research comparing incline and flat movement found that walking at a 10% grade (a steep hill) costs roughly 113% more energy than the same speed on flat ground. For running, the effect is slightly less dramatic because runners are already working at a higher intensity, but a hilly 10k course will reliably burn 15 to 30% more calories than a flat one.
Trail running adds another layer. Uneven footing forces your stabilizing muscles to work harder with every step, and frequent changes in grade keep your body from settling into an efficient rhythm. Wind resistance on exposed courses and soft surfaces like sand or mud also increase the energy cost, though these are harder to quantify precisely.
How to Estimate Your Own Burn
The simplest formula that holds up well across body types: multiply your weight in pounds by 0.63 to get an approximate calorie-per-mile figure, then multiply that by 6.2. A 170-pound runner, for example, would calculate 170 × 0.63 = 107 calories per mile, times 6.2 miles, for about 664 calories total.
GPS watches and fitness trackers that use heart rate data tend to be more accurate than those relying on movement alone, but even heart-rate-based estimates can be off by 10 to 20%. They’re useful for tracking trends over time rather than nailing an exact number on any single run.
Keep in mind that these figures represent gross calorie burn, which includes the calories you would have burned anyway just sitting on the couch. Your net burn from the exercise itself is somewhat lower, typically 15 to 20% less. For weight management purposes, net calories are the more honest number, but most calorie trackers and online calculators report the gross figure.