Rucking Calorie Calculator

How many calories does rucking burn?

A 155 lb person carrying 20 lb at 3.3 mph on flat pavement burns about 315 calories per hour. Without the pack, the same walk burns about 290.

On flat ground the plate adds less than most people expect.

Hills and rough ground are where rucking pays off. The same person with 30 lb burns about 330 calories per hour on the flat, about 520 on a 5% grade, and about 590 on loose sand.

This calculator uses the Pandolf equation, which the U.S. Army developed to predict the energy cost of carrying loads. It is still the most widely tested equation of its kind.

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Rucking calories by pack weight

Hourly totals for a 155 lb person at 3.3 mph (about 18 minutes per mile) on pavement.

Hills and terrain matter more than the plate

Hourly totals for a 155 lb person carrying 30 lb at 3.3 mph. Changing the route has a bigger effect than adding weight.

The Pandolf equation

M = 1.5W + 2.0(W + L)(L/W)² + η(W + L)(1.5V² + 0.35VG) M is metabolic rate in watts. W is body mass and L is pack mass, both in kg. V is speed in meters per second. G is the uphill grade in percent. η (eta) is a terrain factor: 1.0 for pavement or a treadmill, 1.1 for a dirt road, 1.2 for light brush, 1.5 for heavy brush, 1.8 for swampy ground, and 2.1 for loose sand. One watt held for a minute burns 0.01433 kcal.

Worked example: an 80 kg person carries 20 kg at 1.34 m/s (3 mph) on flat pavement. 1.5 × 80 = 120. 2.0 × 100 × (0.25)² = 12.5. 1.0 × 100 × (1.5 × 1.80) = 269. Total 402 W, or 5.8 kcal per minute, about 345 kcal per hour.

The grade term is multiplied by the combined mass of body and pack, which is why a heavy pack makes hills so much harder.

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How to use this calculator

Weigh the pack on a bathroom scale: weigh yourself with it on, then without it, and subtract. Enter your average moving speed from a watch or app.

Most rucks fall between 3 and 4 mph.

Grade is the average uphill slope. For an out-and-back or loop that ends where it started, leave grade at 0 and pick a rougher terrain type if the route is hilly. The Pandolf equation does not give credit for downhill sections, so a loop with 5% up and 5% down would be overstated if you entered 5%.

The result shows the extra calories from the pack and your load as a percentage of body weight. Loads over 30% of body weight are in the range used in military studies.

If you have back, hip, or knee problems, ask a doctor or physical therapist before carrying heavy loads.

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How accurate is Pandolf?

Army researchers tested several load-carriage equations against measured energy use while soldiers marched 10 km over mixed terrain carrying 30% to 45% of body mass. All of them underestimated. The Santee equation, which adds a downhill correction to Pandolf, came closest, averaging 13 W low.

Treadmill rucking is a different case. In a study of 30 adults carrying 20% and 40% of body weight, oxygen use was higher on the treadmill than overground at the same speed. The calculator reads a treadmill the same as pavement, so treadmill ruckers may burn a little more than it shows.

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Setting up the pack

A review of soldier load carriage found that the closer the load sits to your center of mass, the less energy it costs. Keep the plate tight against your back. High placement suited even ground and lower placement uneven ground. A hip belt takes pressure off the shoulders.

Weight on the feet is costly.

Each extra kilogram in footwear raised energy cost by 7% to 10%. Wear light, broken-in shoes.

Common rucking injuries are blisters, foot stress fractures, back strain, knee pain, and numbness or tingling in the arms from tight shoulder straps. Most come from adding weight or distance too fast.

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Rucking vs walking, hiking, and running

Flat rucking with a moderate pack burns a little more than brisk walking. Hilly rucking can match easy running. With 30 lb on an 8% grade, the calculator gives about 630 kcal per hour for a 155 lb person, similar to running 6 mph for an hour. The Compendium backs this up: climbing hills with 20 lb or more at a brisk pace is rated 10.0 MET, while flat walking at 3.1 mph is 3.8.

Rucking also counts toward the weekly activity guideline. A flat ruck at 3 to 4 mph is usually moderate intensity. Add hills and it becomes vigorous.

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Where these numbers can be off

Pandolf was built from soldiers walking on treadmills and outdoors. It underestimated on rough mixed terrain in field testing and does not account for downhill sections, fitness, or technique.

Treat the result as a floor for hard routes and an estimate for flat ones.

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How it works

The calculator uses the Pandolf equation: M = 1.5W + 2.0(W + L)(L/W)² + η(W + L)(1.5V² + 0.35VG), where M is metabolic rate in watts, W is body mass and L is load in kg, V is speed in m/s, G is grade in %, and η is a terrain factor from 1.0 (pavement) to 2.1 (loose sand). One watt sustained for a minute equals 0.01433 kcal.

Practical tips

• Weigh your loaded pack instead of guessing.
• Choose a hilly route to add calories. It beats adding more plates.
• Keep the load tight to your back, and use a hip belt for heavy packs.
• Wear light shoes. Weight on your feet costs the most.
• Add weight or distance slowly, a little each week.

Frequently asked questions

• How many calories does rucking burn per hour?For a 155 lb person at 3.3 mph on flat pavement: about 300 kcal with 10 lb, 316 kcal with 20 lb, 332 kcal with 30 lb, and 349 kcal with 40 lb. Without a pack the same walk burns about 288 kcal.
• Does rucking burn more than walking?On flat pavement, only a little: a 20 lb pack adds about 10%. The pack multiplies the cost of hills and rough ground, though. With 30 lb, a 5% grade raises the hourly burn from 332 to about 520 kcal, and loose sand raises it to about 590.
• How heavy should my ruck be?Start light and add weight in small steps. Most beginner plans, including the one in the video on this page, start at 5 to 20 lb and hold it for several weeks. Military studies use 30% to 45% of body weight, which takes months of training to handle.
• Where should the weight sit in the pack?High and tight against your back. Loads close to your center of mass cost the least energy, and a hip belt shifts some weight off the shoulders. Weight on the feet is the most expensive: each extra kilogram in footwear raises energy cost by 7% to 10%.
• Is rucking on a treadmill the same as outside?Not quite. Carrying 20% or 40% of body weight took measurably more oxygen on a treadmill than overground at the same speed. Outdoor terrain and hills usually make up the difference and more.
• How accurate is the Pandolf equation?It is the most tested load-carriage equation. Over 10 km of mixed terrain with heavy loads, Pandolf with a downhill correction came closest to measured energy use of the equations tested, though it still underestimated on average.

Related calculators

References

1. Pandolf KB, Givoni B, Goldman RF. J Appl Physiol 1977. Predicting energy expenditure with loads while standing or walking very slowly
2. Looney DP, et al. Mil Med 2018. Metabolic costs of military load carriage over complex terrain
3. Knapik JJ, et al. Mil Med 2004. Soldier load carriage: historical, physiological, biomechanical, and medical aspects
4. Vickery-Howe DM, et al. Ergonomics 2021. Treadmill load carriage overestimates energy expenditure of overground load carriage
5. Herrmann SD, et al. J Sport Health Sci 2024. 2024 Adult Compendium of Physical Activities: A third update of the energy costs of human activities
6. U.S. Department of Health and Human Services. Physical Activity Guidelines for Americans, 2nd edition