Walking one mile burns roughly 50 to 170 calories, depending almost entirely on your body weight. Running that same mile burns more, but not as much more as most people assume. The popular “100 calories per mile” rule is a decent shortcut for someone around 150 to 170 pounds, but it can be off by 40% or more if you’re significantly lighter or heavier.
Calories Burned Walking One Mile by Body Weight
Your body weight is the single biggest factor in how many calories a mile costs you. A heavier body requires more energy to move the same distance. Here’s what the numbers look like at two common walking speeds:
- 100 lbs: 53 calories (moderate pace), 57 calories (brisk pace)
- 140 lbs: 74 calories, 80 calories
- 160 lbs: 85 calories, 91 calories
- 180 lbs: 96 calories, 102 calories
- 200 lbs: 106 calories, 114 calories
- 220 lbs: 117 calories, 125 calories
- 250 lbs: 133 calories, 142 calories
- 300 lbs: 160 calories, 171 calories
A “moderate” pace here is about 3.5 mph, which covers a mile in roughly 17 minutes. A “brisk” pace is 4 mph, finishing a mile in about 15 minutes. The difference between the two speeds adds only 5 to 11 calories per mile, so walking faster mostly saves you time rather than dramatically increasing your burn.
Running vs. Walking the Same Mile
Running burns more calories per mile than walking, but the gap is smaller than it feels. The reason is simple: while running is far more intense minute to minute, you finish the mile much faster, so the total energy cost doesn’t scale the way you’d expect.
One useful way to compare activities is through their metabolic intensity. Walking at 3.0 mph is roughly 3.5 times more demanding than sitting still. Running at 6.0 mph (a 10-minute mile) is about 10 times more demanding than sitting. That makes running nearly three times more intense per minute, but since you spend about half as many minutes covering the mile, the total calorie cost per mile is roughly 20 to 30% higher for running compared to walking at the same body weight. For a 160-pound person, that translates to roughly 85 calories walking versus about 110 to 115 calories running one mile.
Why the “100 Calories Per Mile” Rule Falls Short
You’ll see the round number of 100 calories per mile repeated everywhere, and it’s not terrible as a rough guide. For an average-sized adult, it lands in the right ballpark for both walking and running. But it ignores the variable that matters most: your weight. A 120-pound person walking a mile burns closer to 65 calories, while a 250-pound person burns over 130. That’s a twofold difference the rule completely misses.
If you want a quick formula without a chart, the standard calculation multiplies 0.0175 by the activity’s intensity value by your weight in kilograms, giving you calories per minute. Multiply that by how long the mile takes, and you get a reasonable estimate. But for most people, just finding your weight range in the table above is faster and accurate enough.
Hills and Terrain Change the Math
Walking or running uphill adds a significant calorie cost. For a 150-pound person, every 1% of uphill grade adds about 10 extra calories per mile, roughly a 12% increase. So a mile on a 5% incline burns about 50% more than the same mile on flat ground. That’s a substantial difference, and it’s one reason hilly routes feel so much harder than their distance suggests.
The surface under your feet matters too. Walking a mile on soft sand burns 20 to 50% more calories than walking the same distance on pavement. Loose gravel, snow, and uneven trails have a similar effect, though not quite as extreme as deep sand. Your muscles work harder to stabilize with each step, and your foot sinks slightly instead of pushing off a firm surface.
How Accurate Is Your Fitness Tracker?
If you’re relying on a smartwatch to count your mile’s calories, take the number with a grain of salt. Research from Harvard’s engineering school found that wearable devices have estimated error rates of 30 to 80% for calorie calculations. The step count and distance tend to be fairly reliable, but the calorie translation involves assumptions about your metabolism, efficiency, and body composition that the device can only guess at.
The calorie figure your watch shows is also a “gross” number, meaning it includes the calories you would have burned anyway just sitting on the couch. To figure out how many extra calories your walk actually cost you, subtract what you’d burn at rest for the same time period. For most people, that’s roughly 1 calorie per minute. So if your brisk mile took 15 minutes and your watch says 100 calories, the net burn from the exercise itself is closer to 85.
Putting It Into Practical Terms
One mile of walking is a modest calorie burn on its own. For a 160-pound person, that 85 to 91 calories is about the energy in a medium banana or a single slice of bread. It takes roughly 35 miles of walking to burn a pound of body fat, assuming no changes in what you eat. That’s not discouraging; it’s just realistic. The value of a daily mile adds up over weeks and months, not individual walks.
If your goal is to increase the calorie cost of a mile without running, the most effective lever is choosing hilly terrain. A steep route can nearly double the burn compared to a flat sidewalk. Walking on grass, trails, or sand also helps. And of course, the more you weigh, the more each mile costs in energy, which means the calorie benefit of walking is actually greatest for the people who are just starting out.