Backpacking Pack Weight Budget Calculator
Use the 20% body weight rule to plan your backpacking load.
Enter your weight and trip length to get max pack weight and a per-system breakdown.
The 20% rule: your loaded pack should weigh no more than 20% of your body weight. A 160 lb person carries a max of 32 lbs. Exceed that regularly and you increase injury risk — stress fractures, knee problems, and lower back strain are all strongly associated with overloaded packs.
Max pack weight = body weight × 0.20
Base weight is everything in your pack minus food, water, and fuel. Ultralight backpackers target a base weight under 10 lbs. Traditional backpackers often carry 15–20 lb base weights. The difference almost always comes from the big three: shelter, sleep system, and pack.
Food scales with trip length at roughly 1.5 lbs per person per day for freeze-dried meals and high-calorie snacks. Water adds 2.2 lbs per liter; most hikers carry 1–2 liters between sources.
Winter backpacking pushes base weight up significantly. A sleeping bag warm enough for sustained below-freezing nights can weigh 3–5 lbs by itself. Add insulated layers, extra fuel for melting snow, and a sturdier shelter and you are easily 8–10 lbs heavier than a summer kit.
If you are consistently over the 20% threshold, the big three is where to look first. They represent 60–70% of base weight for most people. Upgrading to a lighter tent, quilt, and pack is expensive, but the weight savings compound across every step of every mile.
The chart below shows how your weight breaks down by system. Food and water dominate on long trips — which is why resupply points matter for any trip over 4 days.