What the chart shows
- Pace matters more than pack weight. With the same 30 lb pack, going from 3 to 4 mph raises calories per hour by about 54%. Adding 10 lb to the pack at 3.5 mph adds only 3 to 6%.
- A pack adds less than most articles claim. A 30 lb pack adds about 13% over walking for a 180 lb person at 3.5 mph. Claims of 2–3 times more than walking do not match any load-carriage equation we checked.
- Body weight drives the total. Every row of the chart scales almost in proportion to body weight, because the model works per kilogram of the person carrying the load.
How much does a rucking pack add?
The extra cost of a pack depends on the pack's weight as a share of your body weight, not on the pounds alone. In the LCDA equation the percentage is the same for every body weight, so this table applies to everyone.
| Pace | Pack = 10% of body weight | 20% | 30% |
|---|---|---|---|
| 2.5 mph | +6% | +15% | +26% |
| 3.0 mph | +6% | +16% | +28% |
| 3.5 mph | +7% | +17% | +30% |
| 4.0 mph | +7% | +18% | +31% |
Increase in calories per hour over walking at the same pace with no pack. LCDA backpacking equation [1].
Rucking vs walking vs running
Per hour, running still burns more. Per mile, a brisk ruck comes close: a 180 lb person with a 30 lb pack at 4 mph burns about 132 calories per mile, and the same person running at 6 mph about 127.
| Activity (180 lb person) | Pace | kcal / hour | kcal / mile | Source |
|---|---|---|---|---|
| Walking, no pack | 3.5 mph | 371 | 106 | LCDA |
| Rucking, 30 lb pack | 3.0 mph | 343 | 114 | LCDA |
| Rucking, 30 lb pack | 3.5 mph | 420 | 120 | LCDA |
| Rucking, 30 lb pack | 4.0 mph | 530 | 132 | LCDA |
| Running | 5.0 mph | 694 | 139 | Compendium 12030 (8.5 MET) |
| Running | 6.0 mph | 759 | 127 | Compendium 12050 (9.3 MET) |
Walking and rucking: LCDA backpacking equation [1]. Running: 2024 Adult Compendium of Physical Activities MET values [7], using 1 MET = 1 kcal per kg per hour. The two methods are not identical, so treat the running rows as a reference point.
Pandolf vs the US Army's 2022 model
Many online rucking calculators, including ours until October 2026, use the Pandolf equation from 1977 [2]. In 2022, researchers at the US Army Research Institute of Environmental Medicine (USARIEM) published a newer equation for the Army's Load Carriage Decision Aid (LCDA) [1]. Tested against seven independent data sets, it was more accurate than Pandolf: mean error −0.08 W/kg (concordance 0.926) versus −0.46 W/kg (concordance 0.863) for Pandolf.
We ran both equations across the whole chart. At 3 to 3.5 mph, the two agree within 1 to 7%. They split at the edges: at 2.5 mph Pandolf comes out 8 to 11% lower, and at 4 mph with a heavy pack on a light person it is up to 12% lower. That matches independent studies that found Pandolf underestimates at slow walking speeds [5] and with contemporary military loads [4].
| Pace | Pack | LCDA 2022 | Pandolf 1977 | Difference |
|---|---|---|---|---|
| 2.5 mph | No pack | 258 | 237 | +9% |
| 2.5 mph | 20 lb | 275 | 254 | +9% |
| 2.5 mph | 40 lb | 303 | 275 | +10% |
| 3.0 mph | No pack | 305 | 295 | +3% |
| 3.0 mph | 20 lb | 327 | 318 | +3% |
| 3.0 mph | 40 lb | 361 | 345 | +5% |
| 3.5 mph | No pack | 371 | 363 | +2% |
| 3.5 mph | 20 lb | 399 | 394 | +1% |
| 3.5 mph | 40 lb | 444 | 429 | +3% |
| 4.0 mph | No pack | 464 | 442 | +5% |
| 4.0 mph | 20 lb | 502 | 482 | +4% |
| 4.0 mph | 40 lb | 561 | 526 | +7% |
kcal per hour for a 180 lb person on flat pavement. Pandolf with terrain coefficient 1.0 and no grade.
How accurate are these numbers?
Treat every cell as an average for a healthy adult, not a measurement of you.
- Person-to-person spread. Even the LCDA equation, validated on 81 soldiers and civilians from seven data sets, had a standard deviation of 0.59 W/kg around its mean error [1]. For a 180 lb person at 3.5 mph that is roughly ±40 calories per hour.
- The equations were built on military volunteers. The 2022 study tested 30 healthy, active adults aged about 25, carrying backpacks up to 66% of body mass at 0.45–1.97 m/s (1–4.4 mph).
- Vests are different. A weighted vest loads the body differently from a backpack. USARIEM published a separate vest term in 2024 [6]; this chart is for backpacks.
- Smartwatches are untested here. We found no peer-reviewed study that measured how accurately a smartwatch estimates calories while walking with a backpack. If your watch disagrees with this chart, neither number has been validated for that case.
Method
Every number on this page is computed, not estimated by hand. We use equation 4 of Looney et al. (2022), published open-access under CC BY 4.0:
M = Mrest + [0.19 + η × (1.78 × S0.58 + 0.27 × S4 + Mgrade)] × (1 + 1.96 × L1.36)
// S = speed (m/s), L = pack mass ÷ body mass, η = terrain (1.0 = pavement)
// M_grade = 34 × S × G × (1 − 1.05^(1 − 1.1^(100G + 32))), G = rise/run (0 here)
// Convert to calories
kcal per hour = M × body mass (kg) × 0.8604
- Resting rate. The study estimated each subject's resting rate from lean mass. Because the chart cannot know your body composition, we use the standard 1 MET (1 kcal per kg per hour, about 1.16 W/kg). The totals are gross calories, including what you would burn at rest.
- Flat pavement. Terrain coefficient 1.0, no grade. Hills and soft ground add more; the calculator handles both.
- Rounding. Values are rounded to the nearest calorie. Weights convert at 1 lb = 0.453592 kg and speeds at 1 mph = 0.44704 m/s.
- Range. All paces and loads in the chart (up to 42% of body weight) are inside the speeds and loads the 2022 study tested.
Cite this chart
ForgeYourFit. (2026). Rucking calories burned chart: by body weight, pack weight and pace. Retrieved from https://forgeyourfit.com/rucking-calories-chart
You are welcome to reuse these tables in articles, apps or coaching material under CC BY 4.0. Please link to this page as the source.
Sources
- Looney DP, Lavoie EM, Vangala SV, et al. Modeling the Metabolic Costs of Heavy Military Backpacking. Med Sci Sports Exerc. 2022;54(4):646–654. Open-access full text (PMC8919998)
- Pandolf KB, Givoni B, Goldman RF. Predicting energy expenditure with loads while standing or walking very slowly. J Appl Physiol. 1977;43(4):577–581. PubMed 908672
- Looney DP, Santee WR, Hansen EO, et al. Estimating Energy Expenditure during Level, Uphill, and Downhill Walking. Med Sci Sports Exerc. 2019;51(9):1954–1960. PubMed 30973477
- Drain JR, Aisbett B, Lewis M, Billing DC. The Pandolf equation under-predicts the metabolic rate of contemporary military load carriage. J Sci Med Sport. 2017;20 Suppl 4:S104–S108. PubMed 28919496
- Vine CAJ, Coakley SL, Blacker SD, et al. Accuracy of Metabolic Cost Predictive Equations During Military Load Carriage. J Strength Cond Res. 2022;36(5):1297–1303. PubMed 32398631
- Looney DP, Lavoie EM, Notley SR, et al. Metabolic Costs of Walking with Weighted Vests. Med Sci Sports Exerc. 2024;56(6):1177–1185. PubMed 38291646
- Herrmann SD, Willis EA, Ainsworth BE, et al. 2024 Adult Compendium of Physical Activities. Walking codes 17170–17220; running codes 12030 and 12050. pacompendium.com
Frequently asked questions
A 180 lb person carrying a 30 lb pack burns about 343 calories per hour at 3 mph, 420 at 3.5 mph and 530 at 4 mph on flat pavement, using the US Army LCDA backpacking equation. Lighter people burn less and heavier people burn more; the chart above lists body weights from 120 to 260 lb.
At 3.5 mph, a 180 lb person with a 30 lb pack burns about 120 calories per mile. Switch the chart to per mile to see every combination. Per mile, pace matters less than per hour, because a faster pace covers each mile in less time.
Yes. At the same pace, a 30 lb pack adds about 13% for a 180 lb person at 3.5 mph (420 vs 371 calories per hour). The increase depends on the pack as a share of body weight: at 3.5 mph a pack of 10% of body weight adds about 7%, and 30% adds about 30%.
Not per hour. Running at 5 mph burns about 694 calories per hour for a 180 lb person (Compendium code 12030), against about 530 for a 30 lb ruck at 4 mph. Per mile the gap closes: that ruck burns about 132 calories per mile, and running at 6 mph about 127.
Yes, but less than most people expect. For a 180 lb person at 3.5 mph, each extra 10 lb adds about 3 to 6%. Walking faster has a bigger effect: going from 3 to 4 mph with the same 30 lb pack raises calories per hour by about 54%.
They are group averages. In its 2022 validation against seven independent data sets, the LCDA equation had a mean error of -0.08 W/kg with a standard deviation of 0.59 W/kg, so one person can differ by roughly 10%% or more. Hills, soft ground and a vest instead of a backpack all change the real number.
Important
Not medical advice. These are model estimates for healthy adults. If you are new to weighted exercise, have a back, knee or heart condition, are pregnant or postpartum, or are returning from injury, talk to a clinician before you start rucking.