Rucking calorie calculator
Walking with a loaded pack, calculated the way the US Army does it: the Pandolf equation accounts for your weight, the load, the slope and what you're walking on.
Rucking calories per hour at 3 mph on pavement
| Body weight | No pack | 20 lb | 30 lb | 45 lb |
|---|---|---|---|---|
| 140 lb | 229 | 253 | 267 | 292 |
| 160 lb | 262 | 285 | 299 | 322 |
| 180 lb | 295 | 318 | 331 | 353 |
| 200 lb | 328 | 350 | 363 | 385 |
| 220 lb | 360 | 383 | 396 | 416 |
Pandolf tends to underestimate at very slow speeds and on descents; treat numbers as estimates. For unloaded walking we use Compendium METs elsewhere on this site, which give slightly different figures (e.g. 286 kcal/h for 180 lb at 3 mph).
Why terrain matters so much
The terrain factor η multiplies the whole motion term. Loose sand at η = 2.1 more than doubles the cost of moving compared with a road, which is why a beach ruck feels brutal at a pace you'd hold easily on tarmac. Grass and gravel sit in between.
Questions walkers ask
How many calories does rucking burn?
A 180 lb person carrying a 30 lb pack at 3 mph on pavement burns roughly 450–500 calories an hour by the Pandolf equation — around 20–30% more than walking the same route unloaded. Trails, sand and hills push it much higher.
What formula does this use?
The Pandolf load-carriage equation (Pandolf, Givoni & Goldman, Journal of Applied Physiology, 1977), developed for the US Army: M = 1.5W + 2.0(W + L)(L/W)² + η(W + L)(1.5V² + 0.35VG), where W is body mass, L load, V speed in m/s, G grade % and η a terrain factor.
How heavy should my ruck be?
Many beginners start around 10% of body weight and build slowly toward 20–25%. Increase weight or distance, not both in the same week, and keep the load high and tight on your back.
Is rucking better than walking?
It burns more per minute at the same speed and adds a strength stimulus for the back, hips and legs, but it also loads joints more. Walking and rucking work well alternated through a week.