Estimate gross calories burned while walking from your body weight, walking speed and duration.
The result uses standardized MET values and represents a population-level estimate rather than a direct measurement from metabolic testing.
This calculator uses the MET (metabolic equivalent of task) method: your body weight, how fast you walk, and how long you walk determine the total. One MET is the energy you burn at rest; walking at 3 mph costs about 3.8 METs, meaning you burn roughly 3.8 times your resting rate. The formula is:
Calories = MET × Body weight (kg) × Duration (hours)
The MET value comes from your walking speed using the bands below, which match the calculator's processor. Enter pounds and mph if you prefer — the calculator converts to kilograms and km/h first (1 lb = 0.45359237 kg; 1 mph = 1.609344 km/h).
| Walking Speed | MET Value | Effort |
|---|---|---|
| Under 2.0 mph (3.2 km/h) | 2.8 | Slow stroll |
| 2.0–2.5 mph (3.2–4.0 km/h) | 3.0 | Easy walk |
| 2.5–3.0 mph (4.0–4.8 km/h) | 3.5 | Moderate walk |
| 3.0–3.5 mph (4.8–5.6 km/h) | 3.8 | Brisk walk |
| 3.5–4.0 mph (5.6–6.4 km/h) | 4.8 | Fast walk |
| 4.0–4.5 mph (6.4–7.2 km/h) | 5.8 | Very brisk walk |
| Over 4.5 mph (7.2 km/h) | 6.8 | Power walking / near-jog |
180 lb person, 3 mph, 30 minutes. 180 lb = 81.65 kg. 3 mph = 4.83 km/h, which falls in the 3.8-MET band. Calories = 3.8 × 81.65 × 0.5 hours = 155.1 kcal, covering 1.5 miles (2.41 km).
150 lb person, 4 mph, 45 minutes. 150 lb = 68.04 kg. 4 mph = 6.44 km/h, which falls in the 5.8-MET band. Calories = 5.8 × 68.04 × 0.75 hours = 296.0 kcal, covering 3.0 miles (4.83 km).
Notice how much speed matters: the second walker went only 1 mph faster but burned nearly twice the calories of the first, because the walk was longer and the MET value jumped from 3.8 to 5.8.
Because one mile takes 20 minutes at 3 mph and 15 minutes at 4 mph, the per-mile cost is easy to compare:
| Body Weight | Per Mile at 3 mph | Per Mile at 4 mph |
|---|---|---|
| 150 lb (68 kg) | ~86 kcal | ~99 kcal |
| 180 lb (82 kg) | ~103 kcal | ~118 kcal |
| 200 lb (91 kg) | ~115 kcal | ~132 kcal |
| 220 lb (100 kg) | ~126 kcal | ~145 kcal |
These are gross calories — the total your body burns during the walk, including the energy you would have burned at rest anyway. Net calories (the extra cost of walking itself) run roughly 20–30% lower. Gross figures are the standard for activity trackers and food logging, so they are the right numbers for planning.
Body weight is the biggest factor — a heavier body costs more energy to move, which is why the same walk burns more for a 220 lb person than a 150 lb person. Speed matters through the MET bands above: crossing from 3.5 to 4 mph raises your MET from 3.8 to 5.8, a jump of over 50%. Hills and grade add cost fast — walking uphill can double the effort of flat walking, which is why this flat-ground estimate is conservative on hilly routes. Carried load (a heavy backpack, a child carrier, grocery bags) raises the effective weight you are moving. Surface matters too: sand, snow, and soft trails cost more than pavement. Finally, fitness level plays a small role — very fit walkers are slightly more efficient, so they burn a touch less for the same walk.
The highest-leverage change is pace: push your comfortable walk from 3 mph toward 4 mph and you gain roughly 40% more calories per mile. Add hills or stairs — even one hilly loop a week — for a similar boost. Walk-and-talk intervals work well: alternate 2 minutes brisk with 1 minute easy for 30 minutes. And the simplest lever of all is time: a daily 45-minute walk instead of 30 adds 50% more calories with no extra effort per minute. Consistency beats intensity here — a moderate walk you actually do every day outperforms a punishing one you quit after a week.
Further reading: the CDC's physical activity basics cover how much activity adults need each week. This page is for general information only and is not medical advice.
Maintained by Live Fitness Check. Last updated: August 13, 2026. How we test our calculators .
For the same duration and body weight, higher walking speeds generally correspond to higher MET values and a larger estimated energy cost.
It estimates gross activity energy using MET values, so the figure includes resting energy during the walking period rather than subtracting it.
Wearables can use heart rate, motion sensors and proprietary algorithms, while this calculator uses standardized population-level MET values.
