Backpack Weight Calculator
Check pack weight as a percentage of body weight. Get an instant assessment for thru-hiking, multi-day trips, and day hikes.
Quick Answer
For thru-hiking, target 20-25% of body weight. A 160 lb hiker should carry 32-40 lb. Over 30% of body weight increases injury risk significantly. Day hikers can comfortably carry 5-15%.
Pack weight is within the ideal range for this trip type. Comfortable for sustained hiking.
About This Tool
The Backpack Weight Calculator measures your pack weight as a percentage of your body weight, the most useful metric for assessing whether your load is safe and sustainable. The right percentage depends on the type of trip you're doing — a 30% load is fine for a one-day approach to a climb but disastrous on day eight of a thru-hike.
Why Body Weight Percentage Matters
Pack weight in absolute pounds is meaningless without context. A 30 lb pack feels light to a 200 lb athlete and unbearable to a 110 lb beginner. The body weight percentage normalizes this. Research from the U.S. Army and outdoor sports medicine suggests that loads above 30% of body weight significantly increase the risk of stress injuries, blisters, joint pain, and exhaustion. Above 40%, pace drops dramatically and recovery time between hiking days lengthens.
The 20-25% Thru-Hike Target
Long-distance thru-hikers (Appalachian Trail, Pacific Crest Trail, Continental Divide Trail) consistently target 20-25% of body weight as the sustainable maximum. This is total pack weight including food, water, and fuel — not just base weight. The math: a 160 lb hiker carries 32-40 lb. With a 12 lb base weight, that leaves 20-28 lb for consumables, which equals 4-5 days of food at 2 lb/day plus 2-3 liters of water. Bigger food carries push you toward the upper end.
Day Hike vs. Thru-Hike
A day hike has different math. You don't need shelter, sleep system, multiple meals, or extensive layers. Day pack weights of 5-15% of body weight are typical and comfortable. The same 160 lb hiker carries 8-24 lb on a day trip — usually water (3 lb), food (1 lb), layers (2 lb), first aid (1 lb), and miscellaneous gear.
Cutting Pack Weight: The Big Three
The fastest path to a lighter pack is the Big Three: backpack, shelter, and sleep system. Combined, these typically account for 60-70% of base weight. A traditional setup might be 8-10 lb across the three. An ultralight setup can hit 4-5 lb. That alone saves 4-5 lb. Specifically: replace a 5 lb pack with a 2 lb frameless pack, swap a 4 lb tent for a 1.5 lb tarp-and-bivy or single-wall shelter, and choose a sleeping bag/quilt rated to actual conditions rather than 20°F colder for safety.
Food Weight Strategy
Food at 1.5-2 lb per day with 100-125 calories per ounce is the standard. A 5-day food carry is 7.5-10 lb. Going lighter means choosing calorie-dense foods (nuts, oils, dehydrated meals, peanut butter). Going heavier means fresh foods that are tasty but inefficient. Many thru-hikers track their food calorie density obsessively. Use our food weight calculator to dial yours in.
Water Strategy
Water is heavy: 2.2 lb per liter. The trick is carrying just enough between sources. Use trail water reports (FarOut, Guthook) to identify reliable streams, springs, and caches. On the AT, you might carry 1 liter and refill every 3-5 miles. On the PCT's Mojave Desert section, you might carry 6+ liters between sources 25 miles apart. Planning your water carries is one of the highest-leverage skills in long-distance hiking.
Pair With Other Trip Tools
Pair this with our food weight calculator, our water needs calculator, our hiking time calculator, and our sleeping bag temp rating. For tent sizing, see our tent capacity calculator.