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Rucking Calorie Calculator: Calories Burned by Weight & Pace

Calculate rucking calories burned using the Pandolf equation. Enter body weight, pack weight, speed, grade, and terrain for precise results.

Updated
Units:

Enter 0 for walking without a pack

Typical ruck: 2.5–4.5 mph

0 = flat · positive = uphill · negative = downhill

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Rougher terrain = higher η = more calories burned at same speed.
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How to Use This Calculator

  1. 1

    Enter your weights

    Type your body weight and pack weight (the loaded rucksack including all gear). Use 0 for pack weight to calculate unloaded walking for comparison.

  2. 2

    Set speed and grade

    Enter your rucking speed in mph (typical: 2.5–4.5 mph) and the terrain grade as a percentage. Flat ground = 0. A moderate hill = 5–8%. Downhill is negative.

  3. 3

    Choose duration or distance

    Select By Duration to enter how long you plan to ruck. Select By Distance to enter your route length — the calculator converts to time using your speed.

  4. 4

    Select terrain surface

    Choose the surface type closest to your route. Each surface has a terrain factor (η) — higher η means more resistance and more calories burned at the same speed.

  5. 5

    Read your results

    See total calories, per-hour rate, per-mile rate, and your burn compared to walking the same route without any pack.

What Each Value Means

Terrain Factor (η) (dimensionless multiplier)
A multiplier in the Pandolf equation representing the energy cost of different surfaces. Treadmill = 1.0 (baseline). Each step on sand or deep snow requires roughly twice the energy of a treadmill step at the same speed, so η = 2.0. Pavement is η = 1.15, packed gravel 1.3, trail 1.4, brush 1.5.
Grade (%) (percent)
The slope of the terrain expressed as rise over run × 100. A 5% grade means you gain 5 feet of elevation for every 100 feet traveled horizontally. Incline increases calorie burn substantially — the grade term in the Pandolf equation scales linearly with both grade and speed.
Metabolic Rate (Watts) (Watts)
The Pandolf equation outputs metabolic rate in Watts — the total power your body produces including resting metabolism. Converted to kcal using: 1 Watt = 0.01433 kcal/min. A typical rucking metabolic rate is 400–800 W depending on weight, load, and terrain.

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Frequently Asked Questions

How many calories does rucking burn per hour?
Rucking burns approximately 400–700+ kcal per hour depending on body weight, pack weight, speed, and terrain. A 180-pound person carrying 35 pounds at 3.5 mph on flat pavement burns about 466 kcal/hr. Add incline or rougher terrain and the burn rises significantly — a 5% grade increases calorie burn by roughly 40–50%.
What is the Pandolf equation for rucking?
The Pandolf equation (1977) is: M = 1.5W + 2(W+L)(L/W)² + η(W+L)(1.5V² + 0.35VG), where W = body mass in kg, L = pack weight in kg, V = speed in m/s, G = grade percentage, and η = terrain factor (1.0 for treadmill, up to 2.0 for sand/deep snow). Convert Watts to kcal: kcal = M × 0.01433 × duration in minutes.
Does rucking burn more calories than walking?
Yes. Rucking burns more calories than walking at the same speed because your body must carry the extra pack weight. For a 180-pound person with a 35-pound pack at 3.5 mph, rucking burns about 16% more calories per hour than walking unloaded. A heavier pack (50+ lbs) raises that difference to 20–25%.
How does pack weight affect rucking calorie burn?
Pack weight increases calorie burn in two ways in the Pandolf equation: the load ratio term 2(W+L)(L/W)² scales quadratically with load relative to body weight, and the terrain term η(W+L)(…) scales linearly with total weight. Each 10 lb added to your pack at 3.5 mph burns roughly 20–35 extra kcal per hour on flat pavement.
How does incline affect rucking calorie burn?
Incline has a large effect. The grade term 0.35 × V × G adds to the speed term 1.5 × V² directly. At 3.5 mph on flat ground the speed factor is 3.67 — at 5% grade it becomes 3.67 + 2.74 = 6.41, nearly doubling the terrain component. Expect 40–60% more calories per hour on a moderate 5% grade versus flat ground.
What terrain burns the most calories while rucking?
Sand and deep snow have the highest terrain factor (η = 2.0) in the Pandolf equation — double the resistance of a treadmill (η = 1.0). Pavement is η = 1.15, packed gravel η = 1.3, trails η = 1.4, and heavy brush/forest η = 1.5. Rucking on sand burns roughly 60–75% more calories per hour than the same speed and load on a treadmill.

References & Sources

  1. [1]
    Pandolf et al., 1977 — Original Load Carriage Research (PubMed) (opens in new tab)

    Supports: Evidence used for the pandolf equation: rucking calorie formula explained, including related formulas, definitions, or reference values.

    Verified

  2. [2]
    US Army Research Institute of Environmental Medicine (USARIEM) (opens in new tab)

    Supports: Evidence used for the pandolf equation: rucking calorie formula explained, including related formulas, definitions, or reference values.

    Verified

  3. [3]
    US Army Physical Readiness Training (opens in new tab)

    Supports: Evidence used for how to calculate calories burned rucking, including related formulas, definitions, or reference values.

    Verified

  4. [4]
    NIH — Dietary Guidelines: Calorie Balance and Weight Management (opens in new tab)

    Supports: Evidence used for rucking for weight loss: calorie deficit planning and weekly schedule, including related formulas, definitions, or reference values.

    Verified