Running a mile burns roughly 100 calories for an average-sized person, but the actual number ranges from about 80 to 170 calories depending on your body weight, pace, and terrain. That simple “100 calories per mile” rule works as a quick estimate, but understanding what shifts the number up or down can help you plan more accurately.
Body Weight Is the Biggest Factor
Your body weight has more influence on calorie burn per mile than almost anything else. A heavier body requires more energy to move the same distance. A 120-pound runner burns roughly 11.4 calories per minute while running, which adds up to about 114 calories over a 10-minute mile. A 180-pound runner burns about 17 calories per minute, totaling around 170 calories for that same mile. That’s nearly a 50% difference for the exact same distance and pace.
This is why generic calorie-per-mile estimates can be misleading. If you weigh 130 pounds, the “100 calories per mile” shorthand is reasonably close. If you weigh 200 pounds, you’re likely burning 30 to 50% more than that estimate suggests.
How Pace Changes the Math
Running faster doesn’t dramatically change how many calories you burn per mile, but it does change how many you burn per minute. Scientists measure exercise intensity using a unit called a MET, which compares any activity to the energy you’d use sitting still. Here’s how running speeds stack up:
- 12-minute mile (5 mph): 8.3 METs
- 10-minute mile (6 mph): 9.8 METs
- 9-minute mile (6.7 mph): 10.5 METs
- 8-minute mile (7.5 mph): 11.5 METs
- 7.5-minute mile (8 mph): 11.8 METs
- 6-minute mile (10 mph): 14.5 METs
A faster runner covers the mile in less time, so the per-mile calorie difference between a jog and a sprint is smaller than you’d expect. The real advantage of running faster is that you burn more calories in a given workout window. If you have 30 minutes, running 8-minute miles gets you nearly four miles and roughly 400+ calories, while 12-minute miles gets you 2.5 miles and fewer total calories.
Running vs. Walking the Same Mile
Running burns up to three times as many calories per minute as walking. But since walking a mile takes longer, the gap narrows when you compare the two over the same distance rather than the same time. Still, running a mile consistently burns more total calories than walking it. A 150-pound person might burn around 100 calories running a mile and about 65 to 75 calories walking that same mile. The difference comes from the greater muscular force, higher heart rate, and greater oxygen demand that running requires with every stride.
Hills Add More Than You’d Think
Terrain has a significant effect on your calorie burn. For a 150-pound person, every 1% increase in grade adds roughly 10 extra calories per mile, which works out to about a 12% bump. That means running a mile on a moderate 5% incline could add 50 or more calories to your total, potentially pushing the burn from 100 calories to 150. If your usual route has rolling hills, you’re burning meaningfully more than a flat-course estimate would suggest.
The Afterburn Effect
Your body doesn’t stop burning extra calories the moment you finish running. After exercise, your metabolism stays elevated as your body works to recover, replenish oxygen stores, and repair muscle tissue. This is sometimes called the “afterburn effect.” Research suggests it adds roughly 6% to 15% to your total calorie expenditure from a workout. So a run that burns 300 calories might produce an extra 18 to 45 calories afterward.
The afterburn is more pronounced after high-intensity efforts like interval training or tempo runs. A slow, steady jog still produces a measurable afterburn, but it’s smaller. If you’re doing sprint intervals or running hard enough that you’re breathing heavily for most of the effort, you’ll see a bigger post-run boost.
Why Your Fitness Watch May Be Wrong
If you rely on a smartwatch or fitness tracker for calorie estimates, treat those numbers with skepticism. Research from Harvard’s School of Engineering found that commercial wearables have estimated error rates of 30 to 80% for calorie tracking. That means a watch reporting 150 calories burned could be off by 45 to 120 calories in either direction. Heart rate-based estimates are generally better than step-based ones, but none are precise enough to treat as exact.
For a more reliable estimate, use your body weight and the MET values above. Multiply your weight in kilograms by the MET value, then by the time spent running in hours. That formula won’t be perfect either, but it’s grounded in standardized exercise science data rather than a proprietary algorithm.
Your Body Adapts Over Time
One counterintuitive finding: becoming a more experienced runner doesn’t mean you burn fewer calories during the run itself. Two people of the same weight running at the same speed burn the same number of calories, regardless of fitness level. What changes is everything else. Research by Herman Pontzer at Duke University found that highly active people don’t necessarily burn more total daily calories than moderately active people. The relationship between activity and total energy expenditure plateaus.
The body appears to compensate in subtle ways. People who exercise intensely may unconsciously move less throughout the rest of the day, reducing fidgeting and general activity. The body also appears to lower its resting metabolic rate by dialing back energy use in functions like immune response and digestion. So while your mile still costs the same calories, your body quietly offsets some of that spending elsewhere in your day. This doesn’t mean running is pointless for weight management. It means that calorie burn from a single mile is just one piece of a more complex energy picture.
Quick Reference by Body Weight
For a flat surface at a moderate running pace (roughly a 10-minute mile), here’s a realistic range of calories burned per mile:
- 120 lbs: ~100 to 115 calories
- 140 lbs: ~115 to 130 calories
- 160 lbs: ~130 to 145 calories
- 180 lbs: ~150 to 170 calories
- 200 lbs: ~170 to 190 calories
Add 10 to 15% for hilly terrain, and subtract slightly if you’re on a treadmill with no incline (the belt assists your forward motion). These are gross calorie estimates, meaning they include the calories you would have burned anyway just being alive during those minutes.