Ruck Pace
16:21 /mi
Total Time
1h 38m
Calories
750
Ruck Pace
16:21 /mi
Pack: 25% of body weight
Total Time
1h 38m
Calories Burned
750
Cal/Hour
459
Pack %
25%
Inputs
Result
45 lbs = 9% slower on road. 15:00 × 1.09 = 16:21. Total time: ~1h 38m. Calories: ~830.
Inputs
Result
30 lbs on trail: 6% pack + 15% terrain. Base 15:00 × 1.06 × 1.15 = ~18:18. Total: ~1h 13m.
Pack weight slows your pace by approximately 2% per 10 lbs of added weight. A 45-lb ruck on a 15:00/mile base walking pace would slow you to roughly 16:21/mile. Heavier packs also significantly increase calorie burn.
| Pack Weight | Pace Impact | Cal/Hr (180 lb person) |
|---|---|---|
| 20 lbs | 4% slower | 410 |
| 35 lbs | 7% slower | 470 |
| 45 lbs | 9% slower | 510 |
| 70 lbs | 14% slower | 590 |
Rucking burns significantly more than walking. A 180-lb person walking at 15 min/mile burns about 370 cal/hr. Add a 45-lb pack and that jumps to roughly 510 cal/hr—a 38% increase. Pack weight, body weight, and terrain all affect the total.
Beginners should start with 10–20% of body weight and build up over 4–6 weeks. Military standard is often 35–45 lbs (dry weight). Never exceed 33% of body weight for extended rucks—injury risk rises sharply.
Road rucking is the baseline. Gravel or smooth trails add about 15% to your pace. Off-trail or rough terrain adds 35% or more. Hills compound the effect—a steep off-trail ruck can take twice as long as the same distance on road.
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Last Updated: Mar 20, 2026
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