What Does Your Pack Really Cost You?
Enter your stats and see the calorie difference between walking and rucking — calculated using the same U.S. Army-grade Pandolf equation powering every Ruckaroo score.
How much you weigh
lbs
80400
What you're carrying
lbs
0150
How far you'll ruck
mi
0.530
How long you'll ruck
min
10480
Without a Pack
🚶 Just Walking
0
calories burned
VS
With Your Pack
🥾 Rucking
0
calories burned
🔥 The Aha Moment
0%
more calories just by adding your pack
That's the power of load carriage — the same walk, the same time, exponentially more effort.
+0 extra calories
0W
Metabolic power while rucking (vs 0W walking)
0:00
Your rucking pace —
0%
Pack as % of body weight —
Pack Weight Impact Curve
How calories change as you add more weight — same distance, same time, your body weight
Walking (no pack)
Rucking (with pack)
% increase vs walking
Powered by the Pandolf Equation (1977) — developed by the U.S. Army Research Institute of Environmental Medicine to predict metabolic cost during load carriage. The key insight: pack weight scales quadratically, not linearly. Doubling your pack weight more than doubles the load penalty, which is exactly why rucking with a heavy pack feels disproportionately harder.
Track Every Ruck. Score Every Effort.
Ruckaroo calculates your exact Ruck Score using this same equation — accounting for terrain, elevation, heart rate, and more. Every ruck, automatically.
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