Running a mile burns roughly 80 to 140 calories for most adults, with your body weight doing the heavy lifting in that estimate. The old “100 calories per mile” rule of thumb works reasonably well for someone around 150 pounds, but it can be off by 30 percent or more once you account for individual differences. What makes the calorie cost of running a mile interesting is how few variables actually matter and how many variables people assume matter but don’t.
Body Weight Is the Single Biggest Factor
Moving a heavier body over the same distance takes more energy. That relationship is strong enough that researchers have built simple prediction equations around it. A study measuring energy expenditure in normal-weight and overweight men and women found that body mass and sex were the dominant predictors of how many calories a mile of running costs. The resulting equation was straightforward: multiply your mass in kilograms by about 0.79, then adjust slightly for sex, with men burning a few more calories per mile than women of the same weight.1The Journal of Strength & Conditioning Research. Comparison of Energy Expenditure to Walk or Run a Mile in Adult Normal Weight and Overweight Men and Women The practical upshot: a 130-pound woman might burn around 85 calories per mile, while a 200-pound man could burn closer to 130. That gap is almost entirely about mass, not fitness level or running form.
This also means that as you lose weight through a running program, each mile burns slightly fewer calories than it did when you started. The reduction is modest per pound lost, but it accumulates over time and partly explains why weight-loss progress from running can slow down after the first few months.
Does Running Faster Burn More Calories Per Mile?
Here is where running differs from most other activities. For cycling or swimming, going faster usually costs more energy per unit of distance. Running is unusual: the energy cost per mile stays remarkably stable across a wide range of speeds. Whether you jog a ten-minute mile or hammer out a seven-minute mile, the calorie burn per mile barely changes. What changes is how quickly you accumulate those calories. The faster runner finishes sooner, burns roughly the same amount during the mile itself, and then moves on to the next one.
This consistency exists because the mechanics of running are relatively fixed. Each stride involves launching your body off the ground and catching it again. A faster pace means more strides per minute and slightly longer strides, but the total mechanical work over a given distance stays roughly constant. The body does become a little less efficient at very high speeds as form breaks down and the anaerobic energy system kicks in, but for the range of paces most recreational runners sustain, the per-mile cost is nearly flat.
So if your goal is to burn more total calories in a 30-minute run, running faster will help because you cover more ground. But if you’re counting calories per mile specifically, pace is one of the least important variables.
Running Versus Walking the Same Mile
A persistent question is whether walking a mile burns the same number of calories as running it. The answer is no, but the gap is smaller than most people expect. Running generally costs more per mile than walking because the bouncing, airborne gait of running is mechanically less efficient than the smoother, always-in-contact-with-the-ground motion of walking. One study comparing weighted walking to running found that gross energy cost during running was about 120 to 130 calories per mile, and weighted walking came in at 120 to 158 calories per mile, sometimes matching or exceeding the running cost.2PubMed. Intensity and energy cost of weighted walking vs. running for men and women That said, the walking figures were inflated by the added load the participants carried. Unloaded walking at a comfortable pace typically burns about 60 to 80 percent of what running does over the same distance.
Where this matters practically is for people who can’t run due to joint issues or are just starting out. Walking the same route still burns a substantial fraction of the calories, and you can close most of the gap by walking briskly, choosing a hillier route, or carrying a pack. The calorie-per-mile difference between a brisk walk and an easy jog narrows to the point where, for weight-management purposes, either approach works over the long run.
How Hills Change the Math
Running uphill costs dramatically more energy per mile than running on flat ground. Research on the energy cost of running at extreme gradients found that the cost of transport on the level was about 3.4 joules per kilogram per meter. At a steep 45-percent positive grade, that figure jumped to roughly 19 joules per kilogram per meter, about five and a half times higher.3PubMed. Energy cost of walking and running at extreme uphill and downhill slopes You don’t need a 45-percent grade to feel the difference. Even a moderate hill noticeably increases oxygen demand and heart rate, which translates directly to higher calorie burn per mile.
Downhill running, on the other hand, is cheaper in energy terms but only up to a point. The same research showed that the cost of transport dropped to its lowest at about a negative 20-percent slope, roughly half the cost of level running. Steeper descents, however, actually become more expensive again because your muscles have to work hard eccentrically to brake against gravity. So a trail run with rolling hills doesn’t average out to the same calorie cost as a flat road run; the uphill segments add more than the downhill segments subtract.
Predicting the exact calorie cost on hilly terrain is harder than on flat ground because established equations vary in accuracy depending on the slope. A 2025 study comparing several prediction models found that newer equations performed reasonably well on both uphill and downhill segments, while the widely used ACSM equation was less precise on inclines.4PubMed. Metabolic energy expenditure during level, uphill, and downhill running If you run a hilly course and want a calorie estimate, expect most apps and treadmill readouts to be more approximate than they are on flat ground.
Wind, Air Resistance, and Outdoor Conditions
Running outdoors costs more energy than running on a treadmill, and a meaningful fraction of that difference comes from pushing through the air. Classic wind-resistance research found that at middle-distance racing speeds, air resistance accounts for roughly 4 to 8 percent of total energy cost on a calm day.5PubMed. Effects of wind assistance and resistance on the forward motion of a runner At sprinting speeds, the figure jumps to around 8 to 16 percent, depending on the study and measurement conditions.6PubMed Central. Oxygen intake in track and treadmill running with observations on the effect of air resistance For recreational joggers at slower paces, the air-resistance tax is only about 2 percent, so it’s close to negligible.
Running into a headwind amplifies the effect considerably. Oxygen intake increases as the square of wind velocity, meaning a stiff headwind costs far more than a gentle breeze.7PubMed Central. The influence of wind resistance in running and walking and the mechanical efficiency of work against horizontal or vertical forces The same research showed that drafting about one meter behind another runner virtually eliminated air resistance and reduced oxygen consumption by about 6.5 percent at middle-distance speed. If you’ve ever noticed that running with a group on a windy day feels noticeably easier, that’s real physiology, not just psychology.
Temperature and humidity also matter. Running in the heat raises your metabolic rate because the body diverts blood to the skin for cooling and ramps up sweating, both of which cost energy. Extremely cold air can increase calorie burn slightly through shivering and extra respiratory heat loss, though the effect during vigorous exercise is modest because running itself generates so much heat. These climate-related adjustments are real but relatively small compared to body weight and terrain.
The Afterburn Is Real but Modest
After you stop running, your body continues to burn calories at an elevated rate. This phenomenon is sometimes called the “afterburn” and is formally known as excess post-exercise oxygen consumption, or EPOC. The size of this afterburn depends heavily on how hard and how long you ran. A review of the research found that the magnitude of EPOC after aerobic exercise clearly scales with both intensity and duration, driven by processes like replenishing energy stores, clearing lactate, and returning elevated body temperature back to normal.8PubMed. Effect of exercise intensity, duration and mode on post-exercise oxygen consumption
The catch is that even when researchers designed studies to produce a large afterburn, EPOC accounted for only about 6 to 15 percent of the net calorie cost of the exercise itself.9PubMed. Effects of exercise intensity and duration on the excess post-exercise oxygen consumption So if your mile of running burned 100 calories, the afterburn might add another 6 to 15 calories over the hours that follow. That is not nothing, but the early enthusiasm for EPOC as a major contributor to weight loss turned out to be overblown. For a single easy mile, the afterburn is probably in the low single digits. For a hard interval session covering several miles, it’s larger but still a small fraction of the work itself.
How Accurate Is Your Running Watch?
Most runners rely on a GPS watch or phone app to tell them how many calories they burned, and those estimates deserve a healthy dose of skepticism. A study testing three popular sports watches against a metabolic cart found that accuracy varied dramatically with pace. At slower aerobic speeds, the best-performing watch was within a few percent of the true value, but others overestimated by as much as 38 percent or underestimated by 25 percent. At faster anaerobic speeds, every watch tested underestimated calorie burn by 22 to 49 percent.10PubMed Central. Validity of sports watches when estimating energy expenditure during running The error grew worse as intensity increased, meaning the harder you run, the less you should trust your watch’s calorie count.
Newer devices have improved somewhat. A more recent study of Galaxy Watch models during intermittent running found average errors of about 10 to 13 percent, which is more useful for general tracking purposes.11PubMed Central. Validity of Galaxy Watch for Estimating Energy Expenditure During Intermittent Running: Cross-Sectional Study Still, individual readings bounced around enough that on any given run, the number on your wrist could be off by 30 or more calories in either direction.
The takeaway for practical use: treat watch-reported calorie numbers as rough guides rather than precise measurements. They’re useful for comparing one run to another using the same device and settings, but treating them as exact figures when planning calorie intake is risky. If you’re using calorie burn data to decide how much to eat after a run, building in a margin of error prevents the common trap of eating back more than you actually burned.
Prediction Equations and Rules of Thumb
If you don’t trust your watch, what can you use instead? Researchers have tested several established prediction equations against measured energy expenditure during running, and a couple stand out. The ACSM metabolic equation and the Léger equation both predicted running energy expenditure with small errors, making them the most suitable off-the-shelf formulas for estimating what a mile costs.12Medicine and Science in Sports and Exercise. Energy Expenditure of Walking and Running: Comparison with Prediction Equations Some other popular tables and equations performed worse, either overestimating or underestimating by meaningful amounts.
For a quick mental estimate without any formula, the simplest approach is to multiply your weight in pounds by 0.63 (or your weight in kilograms by about 1.4). This gives a ballpark per-mile figure that’s close enough for most purposes. A 160-pound runner gets about 100 calories; a 120-pound runner gets about 76; a 200-pound runner gets about 126. These numbers won’t be exact for any individual, but they’re often closer than what a wrist-based tracker reports, especially at higher intensities where watches tend to undercount.
Running Shoes Actually Make a Measurable Difference
One variable most runners don’t think about in calorie terms is footwear. The shoes you run in affect how efficiently you move, and that efficiency translates directly into energy cost. A controlled study comparing marathon racing shoes found that a newer prototype with a carbon-fiber plate and thick foam midsole reduced the energetic cost of running by about 4 percent compared with two established racing flats, even when shoe weight was matched across all three models.13PubMed Central. A Comparison of the Energetic Cost of Running in Marathon Racing Shoes Four percent doesn’t sound like much, and for a single mile it translates to only a few calories. But over a marathon, it adds up to meaningful energy savings, which is part of why these “super shoes” have become ubiquitous in road racing.
From a calorie-burn perspective, the implication runs in the opposite direction of what some runners want to hear. If you’re running to burn calories rather than to race fast, more efficient shoes mean you burn slightly fewer calories per mile. The difference is small enough that shoe choice shouldn’t drive your training decisions for weight management. But it’s a reminder that the running economy of your body isn’t the only variable. The springiness of the surface you run on, the weight of your shoes, and even whether you’re on pavement versus a soft trail all nudge the per-mile cost slightly up or down.
Why Treadmill Calorie Counters Tend to Overestimate
Treadmill displays are notorious for inflating calorie counts, and the reasons are partly mechanical and partly mathematical. Because there is no air resistance on a treadmill, the actual energy cost per mile is lower than outdoor running at the same speed. Setting the treadmill to a 1-percent incline has long been recommended to compensate, and it does narrow the gap, but many machines don’t default to this and runners often forget. On top of that, treadmill algorithms sometimes use outdated or generous prediction equations. As the comparison of prediction models noted, some widely used formulas overestimate running energy expenditure for a given distance, and treadmill manufacturers tend to prefer the rosier numbers because they make customers feel good about their workout.
If your treadmill asks for your weight before you start, the estimate improves, since body mass is the most important input. If it doesn’t ask, it’s probably using a default weight and the number on the screen could be substantially off. The same logic applies to stationary-bike and elliptical displays, but treadmills are the most relevant comparison because the motion is closest to actual running.
Running on Different Surfaces
Sand, grass, gravel, and trails all demand more energy per mile than paved roads. Soft or uneven surfaces absorb energy that would otherwise be returned to you through ground reaction forces, and they force your stabilizer muscles to work harder with every footfall. Running on dry sand can increase energy cost by 20 to 30 percent compared with a firm surface, making a beach run a surprisingly brutal workout for the same distance. Wet, packed sand is much closer to pavement. Grass and groomed trails fall somewhere in between, adding perhaps 5 to 10 percent depending on how soft and uneven the terrain is.
Trail running introduces elevation changes and technical footing on top of the surface-softness penalty. A rocky, rooty trail mile that includes even modest climbing can easily cost 20 to 40 percent more than the same distance on a flat road. This is worth knowing if you switch between road and trail running and notice that your per-mile pace drops on trails without a corresponding drop in effort. You’re working harder per mile; your pace just doesn’t reflect it.
What About Running Form and Efficiency?
Experienced runners tend to be more economical, meaning they use slightly less oxygen at a given pace. This running economy improves over months and years of consistent training as neuromuscular coordination sharpens and tendons become better at storing and releasing elastic energy. The difference between an efficient and an inefficient runner at the same weight and pace might be 5 to 10 percent in energy cost per mile. That’s meaningful for performance but modest in calorie-counting terms: the efficient runner might burn 95 calories where the inefficient one burns 105.
Interventions to improve running economy through form drills, cadence manipulation, or minimalist footwear have shown mixed results in research. Some runners improve; others don’t, or they improve in a lab test but not in real-world running. The body tends to self-optimize its gait over time, so forcing changes to match some ideal template doesn’t always pay off. From a calorie-expenditure standpoint, the gains from chasing better form are small enough that they shouldn’t be a primary concern for recreational runners focused on fitness or weight management.
Calories Burned Over Longer Distances
Because the per-mile cost is fairly stable across speeds, scaling to longer distances is straightforward. If you burn about 100 calories per mile, a 5K costs roughly 310 calories, a 10K about 620, a half marathon around 1,310, and a full marathon around 2,620. These are rough midpoint estimates for an average-weight runner; your actual numbers scale with your body mass as described above.
One complication on very long runs is that fatigue degrades form, which can slightly increase the energy cost per mile as the run progresses. Glycogen depletion shifts the body toward burning a higher proportion of fat, which is a less efficient fuel source per liter of oxygen consumed. These effects are subtle over a 5K but become noticeable during marathon-distance efforts, where late-race miles may cost 5 to 10 percent more than early ones at the same pace. This partly explains why marathons feel disproportionately harder in the final miles compared with the effort required at the same pace early on.