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Recommended maximum pack weight is 20 percent of body weight. Pack percent is pack weight divided by body weight times 100. At or under 20 percent the pack is within the common guideline.
Hiking guides commonly suggest keeping a loaded backpack at or under 20 percent of body weight for multi-day comfort, with 10 to 15 percent preferred for beginners and children. This is a planning guideline, not a medical rule, and fitness, terrain and trip length all matter.
Twenty percent of 70 kg is 14 kg, so a 12 kg pack sits under the guideline at about 17 percent of body weight. A 15 kg pack on a 60 kg hiker is 25 percent, which is above the guideline and worth lightening.
The whole check is two short calculations. First, recommended maximum pack weight equals 20 percent of body weight, so a 70 kg hiker gets 14 kg and a 90 kg hiker gets 18 kg. Second, the pack weight percentage formula is pack weight divided by body weight, times 100, which tells you how heavy the pack is for you personally, not just in kilograms.
Worked example in the other direction: a 12 kg pack on a 60 kg hiker is 12 divided by 60, times 100, which is 20 percent, exactly at the guideline. The same 12 kg pack on an 80 kg hiker is only 15 percent, which shows why a single kilogram target never fits everyone.
Always weigh the loaded pack, not the empty pack and not a guess. Food, water and fuel count in the total, because they are weight your knees carry on day one even though they get lighter as you eat and drink.
Enter your body weight in kilograms, then enter your loaded pack weight in kilograms. Weigh the pack on a bathroom scale (weigh yourself, then weigh yourself holding the pack, and subtract), or hang it from a luggage scale for a direct reading. Include everything inside the pack, including water, food, fuel and the pack itself.
Click Calculate to see your recommended maximum pack weight, your pack as a percent of body weight, and a verdict against the common 20 percent guideline. If the verdict is above the guideline, use the gap between your pack weight and the recommended maximum as your lightening target: that number is exactly how many kilograms to remove.
Run the check again after repacking. Small changes add up fast, and a second weigh catches the extra items that creep back in at the last minute.
The 20 percent guideline is a general ceiling, not a target for every trip. Common competitor chart bands are: day hike, 10 to 15 percent of body weight, typically 3 to 6 kg total; overnight, 15 to 20 percent, typically 6 to 12 kg; multi-day backpacking, 20 to 25 percent, typically 8 to 15 kg; and ultralight setups, under 10 percent of body weight for the base weight alone.
Read this chart by body weight: at 50 kg, the 20 percent maximum is 10 kg; at 60 kg it is 12 kg; at 70 kg it is 14 kg; at 80 kg it is 16 kg; at 90 kg it is 18 kg; at 100 kg it is 20 kg. Beginners should aim well under the maximum on a first trip, because fitness and pack fit matter as much as the number.
For beginners, a realistic first overnight total is 18 to 25 lb (about 8 to 11 kg) for an average adult, built from a modest base weight plus one day of food and 1 to 2 litres of water. If your total sits above the band for your trip type, the comparisons in the next sections show where the extra weight usually hides.
Base weight is everything in and on the pack except consumables: food, water and fuel. Total pack weight is base weight plus those consumables, and it is the number this calculator checks, because it is what you actually carry at the start. Worn clothing, boots and trekking poles are not in either figure unless you deliberately want a skin-out total.
Ultralight backpacking means a base weight under 10 lb (about 4.5 kg); lightweight means 10 to 20 lb; traditional means over 20 lb. Those labels describe gear choices, not trip length, and a light base weight is what lets a multi-day total stay near the guideline even with several days of food.
School bags follow a stricter variation: guidance for children is often 10 to 15 percent of body weight, not 20 percent. Travel and office packs follow the same percentage idea, with daily carrying usually kept to 10 to 15 percent for comfort. This page is a general guideline, not medical advice: it helps you plan a load, it does not diagnose pain, injury or any health condition, and anyone with a back, knee or shoulder problem should ask a clinician before carrying a heavy pack.
Start with the Big 3, the shelter, the backpack itself and the sleep system, which together make up roughly half of most base weights. A lighter tent or tarp, a lighter framed or frameless pack matched to your total load, and a down bag or quilt instead of a heavy synthetic bag can cut several kilograms in three swaps, more than trimming dozens of small items.
Then weigh every item on a kitchen scale and cut duplicates: one knife, one light source, one spare clothing set. Repackage toiletries, sunscreen and first aid into small containers, leave stuff sacks at home and use one pack liner, wear your heaviest clothes and boots instead of packing them, and plan water refills so you carry only what you need to the next source, since every litre of water weighs 1 kg.
Never cut safety to hit a number. Keep shelter, warmth, rain protection, navigation, first aid and enough food and water for the route and conditions, and keep extra margin on winter, remote or high-altitude trips, where a heavier pack is the right choice. The goal is a lighter pack that still keeps you safe, not the lightest pack possible.
The most common mistake is weighing an empty or half-packed bag and forgetting water and food, which together can add 2 to 4 kg or more. The second is quoting base weight as if it were total pack weight, which makes a kit sound far lighter than the load at the trailhead. The third is using the wrong units, mixing pounds and kilograms, or reading a scale in ounces as pounds.
Pack fit mistakes make a correct weight feel wrong: heavy items packed low or far from your back, a loose hip belt, and shoulder straps carrying a load the hips should carry. Pack dense items high and close to your spine, tighten the hip belt so it sits on your hip bones, and re-check fit after the first kilometre, when straps settle.
Finally, do not treat the 20 percent figure as a pass mark to hit exactly. Lighter is usually better for comfort and joints, and a pack at 19 percent that is badly packed can feel worse than a well-fitted pack at 21 percent. Use the calculator as a planning check, weigh honestly, pack well, and listen to your body on the trail.
Aim for 20 percent of body weight or less for hiking, and less again for beginners. Weigh the loaded pack, including water and food, since those add kilograms fast.
School bag guidance is stricter, often 10 to 15 percent of body weight for children. This calculator uses the 20 percent hiking guideline, so use a lower target for a child.
Base weight is your pack and gear without food, water and fuel, the consumables that get used up during the trip. Total pack weight is base weight plus those consumables, and it is the load you carry on day one. Base weight is useful for comparing gear setups, because it does not change with trip length, while total pack weight is what this calculator checks against the 20 percent guideline.
For most hikers, yes. A 20 kg pack is at the 20 percent guideline only for a 100 kg hiker; for a 70 kg hiker it is about 29 percent, well above the guideline. It can be reasonable for a very fit, heavy hiker on a long, cold or remote trip, but for most multi-day trips a total of 8 to 15 kg is a more comfortable target. Enter your own body weight above to see where 20 kg sits for you.
Beginners should aim under the 20 percent maximum, typically 18 to 25 lb (about 8 to 11 kg) total for an average adult on a first overnight trip. That covers a modest shelter and sleep system, clothing, cooking gear, first aid, one day of food and 1 to 2 litres of water. Start with a shorter, flatter route, weigh the loaded pack before you leave, and build up gradually as fitness and pack fit improve.
Divide your loaded pack weight by your body weight and multiply by 100. For example, a 12 kg pack on a 70 kg hiker is 12 divided by 70, times 100, which is about 17 percent, inside the 20 percent guideline. The calculator above does this division for you and also shows the recommended maximum pack weight in kilograms.
Size follows trip length and season, not just weight. Lightweight travel and fastpacking often use 3 to 30 litres; day hikes and general hiking use 18 to 60 litres; technical and alpine trips use 20 to 50 litres; and expedition or multi-week travel can need 50 to 120 litres. Choose the smallest pack that holds your gear without forcing you to strap items outside, since a half-empty oversized pack carries badly and tempts you to overpack.
Start with the Big 3: shelter, backpack and sleep system, then weigh every item, cut duplicates, repackage liquids into small containers, and wear heavy clothes and boots instead of packing them. Plan water refills so you do not carry litres you do not need. Keep the safety essentials whatever you cut: shelter, warmth, rain gear, navigation, first aid, and enough food and water for the route.