Free load-carriage tool

Rucking Calorie Calculator

Estimate gross energy use for a loaded walk using your pack weight, pace, route grade and terrain-not a generic walking multiplier.

No signup Published load-carriage model Imperial and metric

Enter your route

Use moving distance and average moving pace. Keep grade at zero for a mostly flat route.

The published equation is intended for walking. This tool limits downhill grades and very slow speeds because the model is less reliable there.

Estimated gross energy

0 calories

Complete the route fields to estimate calories, time and load-attributable energy.

Route time
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Calories per hour
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Calories per mile
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Added vs. unloaded
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Load / body weight
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Modeled metabolic power
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This is a population-level planning estimate, not a wearable replacement, medical recommendation or safe-load prescription.

How this rucking calculator works

The calculator uses the Pandolf load-carriage equation, developed to estimate metabolic power from body mass, external load, walking speed, grade and terrain. It then converts modeled watts over your route time into kilocalories.

W is body mass in kilograms, L is carried load in kilograms, T is the published terrain factor, V is speed in meters per second and G is positive grade in percent.

Model: M = 1.5W + 2.0(W + L)(L/W)2 + T(W + L)(1.5V2 + 0.35VG)

The terrain factors shown here follow the U.S. Army Medical Department reference: 1.0 for blacktop, 1.1 for dirt road, 1.2 for light brush, 1.5 for heavy brush and 2.1 for loose sand.

Read the result correctly

Gross, not net, calories

The main number includes the energy cost of the full activity. The unloaded comparison estimates the same route without the pack.

Load-attributable estimate

Added calories isolate the modeled difference created by the pack. It does not mean every extra calorie came only from load in real conditions.

Useful estimate, not exact burn

Weather, stops, pack position, fatigue, gait and mixed terrain can materially change real energy use. Field studies find meaningful error among walking equations.

Use the number to plan a repeatable ruck

  1. Start with a known routeUse a familiar, mostly flat loop and record moving pace rather than total elapsed pace.
  2. Change one variableAdd distance, pace, grade or load-not several at once-so you can judge recovery and gait changes.
  3. Repeat before progressingA route you can repeat with normal walking mechanics is more useful than a one-off heavy effort.
  4. Treat symptoms as a stop signalReduce or stop for sharp pain, numbness, dizziness, chest pressure, unusual shortness of breath or loss of balance.

Method and sources

General educational information only. Do not use a calorie estimate to choose a medically safe load. Get qualified guidance before loaded exercise if you have an injury, balance concern, cardiovascular condition, pregnancy or another condition affected by exercise.