Most people starting out should carry around 10% of their body weight and build from there. For a 180 lb person that is about 18 lb — which usually feels disappointingly light, and is still the right answer.
Estimated burn
406 kcal ±10%
- 478 kcal per hour
- 135 kcal per mile
- +91 vs. walking it unloaded
All inputs within validated ranges.
Engine v1.1.0 · How this is calculated · What changed
One thing to be straight about: these are training conventions, not a validated equation. Unlike the calorie figures on this site, there is no measured research behind the exact percentages. They are what experienced ruckers and military programmes converge on. Treat them as a sensible starting point, not a prescription.
| Experience | General fitness | Strength and conditioning | Military or event prep |
|---|---|---|---|
| New to rucking | 10% | 13% | 15% |
| Rucking regularly | 15% | 20% | 25% |
| Well conditioned | 20% | 28% | 33% |
Why one third of body weight is the usual ceiling
Above roughly a third of body weight, two things happen together. Gait changes measurably — stride shortens, posture leans forward, ground contact time rises. And the load penalty in the Pandolf equation is growing with the square of the load ratio, so cost is accelerating just as your mechanics are degrading.
GORUCK recommends the same one-third ceiling. Military loads routinely exceed it, but they do so with years of conditioning, a specific operational reason, and a well-documented injury rate. None of those apply to a Saturday morning.
Progressing safely
- Change one variable at a time. Add weight or add distance, not both in the same week.
- Hold a new load for two or three sessions before adding more. Connective tissue adapts slower than muscle, and it is the tissue that fails.
- Add roughly 5 lb at a time once you are past the first few weeks.
- Distance before weight. Build to a comfortable hour under a light load before making the load heavy.
- Back off when something aches into the next day. Rucking injuries are almost always accumulation, not one bad step.
Does pack weight include everything?
Yes. Enter total carried weight — plates, pack, water, phone, jacket, all of it. Water is the one people forget: three litres is about 6.6 lb, and it disappears as you drink it, so a long ruck gets lighter as it goes.
Body armour, boots and heavy clothing sit in a grey area. The equation’s load term is for weight carried on the torso, so armour counts. Footwear does not behave the same way — weight on your feet costs disproportionately more per pound, and this model does not capture that.
What to actually put in the pack
Ruck plates are the tidiest option — flat, dense, they sit high against your back and do not shift. Sandbags and bricks work but move around, and a load that shifts is both less comfortable and harder on your posture.
Whatever you use, get it high and tight against your spine. The same weight low and loose feels heavier and changes how you walk.
Related
- Rucking calorie calculator — what this load costs you
- Pace calculator — how load affects your pace
- Calorie chart — burn by body weight and load