Work out backpack weight limit instantly with clear inputs, formula shown and shareable results.
The usual guidance is 20% of body weight for a fit hiker, less for beginners and up to 25% for experienced walkers. Consumables are the variable: about 800 g of food per day plus water, so a long trip needs a much lighter base weight.
Pack weight
maximum = body weight x fitness percentage; total = base weight + food and water
Everything except food, water and fuel — the part you can genuinely reduce through equipment choice. Ultralight hikers target under 5 kg.
1-1.5 litres between reliable sources in temperate weather, more in heat. Water is 1 kg per litre, so carrying less and refilling more often is the lightest strategy.