Most backpackers need 3,500–5,000 calories per day, depending on body weight, pack weight, terrain and temperature. A 75 kg hiker carrying a 15 kg pack on alpine terrain burns approximately 4,200 kcal in an 8-hour day — roughly twice the intake of a sedentary office day. Planning for fewer than 3,000 kcal on a multi-day trip leads to measurable energy deficits and impaired decision-making by day three.
How Many Calories Does Hiking Actually Burn Per Hour?
Hiking burns 400–700 kcal per hour on flat to moderate terrain with a loaded pack. The Compendium of Physical Activities (2024 update) lists moderate hiking at a MET value of 5.3 for a 70 kg person — approximately 370 kcal/hr on flat ground. Add a 10 kg pack: calorie burn increases by 8–12%. Add a 15% gradient: burn increases by a further 30–40%.
A practical formula: multiply your body weight in kg by 6.5 to estimate hourly calorie burn on moderate terrain with a 10–15 kg pack. For a 70 kg hiker: 70 × 6.5 = 455 kcal/hr. Over an 8-hour day, total active burn reaches 3,640 kcal. Add your basal metabolic rate (approximately 1,700 kcal for a 70 kg adult) and total daily expenditure reaches approximately 4,000–4,500 kcal.
How Does Pack Weight Affect Calorie Burn on the Trail?
Every additional kilogram of pack weight increases calorie expenditure by approximately 8%, according to research published in Wilderness and Environmental Medicine (2021). A hiker carrying 20 kg burns 16% more calories than the same hiker carrying 5 kg at identical speed and gradient. This is one of the strongest arguments for reducing pack weight — lighter hikers cover more ground and arrive less depleted.
- 5 kg pack (ultralight): ~400 kcal/hr on moderate terrain
- 10 kg pack (lightweight): ~450 kcal/hr on moderate terrain
- 15 kg pack (standard): ~490 kcal/hr on moderate terrain
- 20 kg pack (heavy): ~530 kcal/hr on moderate terrain
This is why the ultralight movement is not just about comfort — it directly lowers calorie demands, extends endurance and improves daily mileage. Pairing a sub-700 g ultralight backpack with lightweight trail runners is the most effective way to reduce total system weight.
What Are the Best High-Calorie Foods for Backpacking?
Calorie density — kcal per 100 g — is the primary metric for backpacking food selection. You carry weight, not volume, so foods that pack more energy per gram reduce total food weight for a given calorie target. At 4,000 kcal per day, you need food averaging at least 500 kcal/100 g to keep daily food weight under 800 g.
| Food | kcal/100 g | Weight for 500 kcal | Best use |
|---|---|---|---|
| Olive oil | 884 kcal | 57 g | Add to hot meals |
| Macadamia nuts | 718 kcal | 70 g | Trail snack |
| Dark chocolate (70%+) | 600 kcal | 83 g | Energy boost |
| Peanut butter (sachets) | 593 kcal | 84 g | Lunch / snack |
| Freeze-dried meals | 450–520 kcal | 96–111 g | Camp dinner |
| Tortillas (plain) | 310 kcal | 161 g | Lunch base |
| Instant oats | 371 kcal | 135 g | Breakfast |
How to Plan Your Daily Food Weight for a Backpacking Trip
The target for most backpackers is 450–550 g of food per day — achievable when average calorie density across all meals and snacks reaches 500–600 kcal/100 g. For a 7-day trip at 4,000 kcal/day and 500 kcal/100 g average density:
- Daily food weight: 800 g
- Total food weight: 5.6 kg
- Day 1 pack weight with food + 10 kg base: 15.6 kg
- Day 7 pack weight after consuming food: 10 kg
Boosting calorie density to 600 kcal/100 g (adding olive oil to meals, switching to macadamia nuts as main snack) drops daily food weight to 667 g — saving 0.93 kg over the full trip with no calorie reduction. According to the Adventure Alan ultralight methodology, optimising calorie density is the single highest-return food strategy for reducing total pack weight after shelter and sleep system. For a deeper look at pack selection to carry all this food efficiently, see the best ultralight backpacks of 2026.
Frequently Asked Questions
How many calories per day for a thru-hike like the PCT or Appalachian Trail?
Most thru-hikers consume 4,000–6,000 calories per day during peak mileage weeks. Even hikers consuming 5,000+ kcal/day often lose 5–10 kg of body mass over a 5-month thru-hike, indicating that field calorie expenditure consistently exceeds intake for most hikers.
What is the best food for backpacking for maximum energy?
The highest calorie-density foods are olive oil (884 kcal/100 g), macadamia nuts (718 kcal/100 g) and peanut butter sachets (593 kcal/100 g). Combining these with freeze-dried dinners and instant oats for breakfast creates a balanced macro profile — fats from nuts and oil, carbohydrates from grains, protein from nuts and meat-included freeze-dried options.
Should I eat more on cold-weather backpacking trips?
Yes — cold significantly increases calorie burn. At 0 °C versus 20 °C, a hiker burns approximately 150–300 extra kcal per hour due to thermogenesis. On a full winter day at sub-zero temperatures, total calorie expenditure can reach 6,000–7,000 kcal. Increase food weight to 650–750 g/day in cold conditions and prioritise fat-rich foods, which burn more efficiently in cold than simple carbohydrates.
How much water should I drink while backpacking?
The general guideline is 500 ml per hour of active hiking in moderate temperatures, increasing to 750 ml/hr above 25 °C or at altitude above 3,000 m. Electrolyte balance is as important as volume: sweating depletes sodium, potassium and magnesium. Add electrolyte tablets or salty snacks to your nutrition plan on days exceeding 25 km.
Can I lose weight while backpacking even if I eat a lot?
Yes — almost all thru-hikers experience net weight loss regardless of food intake. The calorie deficit between expenditure (4,000–6,000 kcal/day) and practical intake (2,500–4,000 kcal/day, limited by appetite suppression at altitude and pack space) consistently produces a deficit. Most thru-hikers lose 0.5–1 kg per week after the first two weeks.