Endurance
Rucking vs walking: how many more calories do you burn?
Rucking — walking with a weighted backpack — has gone from a military training staple to a popular way to make walking harder without running. It’s simple, low-impact and easy to fit into a day. The obvious question: how much more does the pack actually burn? This guide puts numbers on it, shows what changes the burn most, and explains how to start safely.
Rucking vs walking: the numbers
These estimates are for an 80 kg (176 lb) person walking at 3 mph (4.8 km/h) for an hour, calculated with the Pandolf load-carriage equation:
| Scenario | Per hour | Per mile |
|---|---|---|
| Walking, no pack | 289 kcal | 97 kcal |
| 10 kg (22 lb) pack | 314 kcal | 105 kcal |
| 20 kg (44 lb) pack | 346 kcal | 116 kcal |
| 30 kg (66 lb) pack | 385 kcal | 129 kcal |
| 20 kg pack, dirt road | 369 kcal | 122 kcal |
| No pack, 5% incline | 450 kcal | 150 kcal |
| 20 kg pack, 5% incline | 548 kcal | 182 kcal |
| 20 kg pack, loose sand | 601 kcal | 200 kcal |
You can plug in your own weight, pack, speed, incline and terrain with the rucking calories calculator.
How much the pack adds
On flat ground, a pack adds less than most people expect. A 20 kg (44 lb) pack — a heavy ruck for most beginners — raises the hourly burn by about 20%. Each extra 10 kg adds roughly 10 kcal per mile.
That doesn’t make the pack pointless: it adds strength and endurance training for your back, hips and legs. But if calories are your main goal, weight isn’t the most efficient lever.
Hills and terrain
Hills change everything. Walking up a 5% incline with no pack burns about 450 kcal an hour — more than the 20 kg pack on the flat. Add the pack on the same hill and it jumps to about 548.
Terrain matters too. Soft ground makes every step less efficient, and the Pandolf equation captures this with a terrain factor. A dirt road adds about 10% over pavement, while loose sand costs about 75% more than a road with the same pack.
| Terrain | Factor (η) | 20 kg pack, per hour |
|---|---|---|
| Paved road or treadmill | 1.0 | 346 kcal |
| Dirt road | 1.1 | 369 kcal |
| Light brush | 1.2 | 392 kcal |
| Heavy brush | 1.5 | 462 kcal |
| Loose sand | 2.1 | 601 kcal |
| Soft snow (15 cm) | 2.5 | 694 kcal |
Speed
Walking faster raises the burn per hour, and the effect grows with speed because the equation includes speed squared. For the same 80 kg person with a 20 kg pack on a road:
| Speed | Per hour | Per mile |
|---|---|---|
| 2.5 mph | 275 kcal | 109 kcal |
| 3 mph | 346 kcal | 116 kcal |
| 3.5 mph | 430 kcal | 122 kcal |
| 4 mph | 526 kcal | 132 kcal |
Moving faster covers more ground in the hour, so the cost per mile changes much less than the cost per hour.
Your body weight
Heavier people burn more carrying the same pack, because they are moving more total mass. With a 20 kg pack at 3 mph on a road:
| Body weight | Per hour |
|---|---|
| 60 kg (132 lb) | 278 kcal |
| 70 kg (154 lb) | 312 kcal |
| 80 kg (176 lb) | 346 kcal |
| 90 kg (198 lb) | 381 kcal |
| 100 kg (220 lb) | 416 kcal |
How the estimates are calculated
The Pandolf equation was developed for the US Army in 1977 to predict the energy cost of walking with a load. It is still the standard model for load carriage:
M (watts) = 1.5W + 2.0(W + L)(L/W)² + η(W + L)(1.5V² + 0.35VG)
W is body weight and L pack weight in kg, V speed in m/s, G incline in percent and η the terrain factor. Watts are converted to calories at 1 watt ≈ 0.01433 kcal per minute. The equation covers level and uphill walking; downhill walking needs a separate correction.
Studies of modern military loads found the Pandolf equation can under-predict energy use by 12–33%, so treat these figures as conservative.
Benefits beyond calories
- Strength and posture. Carrying load works your upper back, core, hips and legs.
- Low impact. It raises the intensity of walking without the pounding of running.
- Practical fitness. It builds the endurance you need for hiking, backpacking and outdoor work.
- Sustainability. Many people find a long ruck easier to stick with than a run — and the workout you keep doing burns the most over a year.
How to start rucking
- Pick a pack with padded shoulder straps and, ideally, a hip or sternum strap. Keep the weight high and close to your back.
- Start light: about 10% of your body weight, for 30–45 minutes on flat ground.
- Add distance first, then hills, then weight — changing only one thing at a time.
- Build towards 20–25% of body weight over weeks or months, if your goals need it.
- Ruck two or three times a week, with easier days in between.
Staying injury-free
- Wear supportive, broken-in shoes and good socks to prevent blisters.
- Stand tall; if you have to lean far forward, the pack is too heavy or too low.
- Be careful going downhill — shorten your stride and slow down.
- Back off if you feel sharp pain in your feet, knees, hips or back.
Frequently asked questions
How many calories does rucking burn?
An 80 kg (176 lb) person carrying 20 kg at 3 mph on flat ground burns roughly 346 kcal an hour, versus about 289 walking at the same pace without a pack. Hills, soft ground and faster speeds raise it considerably.
Does rucking burn more calories than running?
Usually not per minute — running is more intense. But rucking can match or beat an easy jog when you add hills or soft terrain, and many people can ruck for much longer, with less impact.
How heavy should my ruck be?
A common starting point is about 10% of body weight, building gradually towards 20–25% over weeks or months. Increase distance or time before adding weight.
Is rucking good for weight loss?
It can help. Rucking burns more than walking and is easy to do regularly, which is what matters most. Weight loss still depends on your overall calorie balance, so pair it with sensible eating.
How far should I ruck?
Start with 30–45 minutes or 2–3 miles on flat ground. Once that feels easy for a couple of weeks, extend the distance, then add hills, then add weight.
References
- Pandolf KB, Givoni B, Goldman RF. Predicting energy expenditure with loads while standing or walking very slowly. J Appl Physiol. 1977;43(4):577–581. pubmed.ncbi.nlm.nih.gov/908672/
General fitness information, not medical advice. Figures are estimates calculated with the formulas cited above. Check with a doctor or qualified coach before major changes to diet, supplements or training. Read the full medical disclaimer and how we write and check these pages in our editorial policy.
