Trail Camp Water Filtration Calculator
Don't run dry on the trail. Enter your group size, trip length, and daily water needs per person to calculate total water to filter, plus how many filter cartridge uses you'll need based on your filter's rated capacity.
About this calculator
Calculate how much water you need to filter or treat per day on a backpacking or camping trip based on group size, trip length, and activity level.
Frequently Asked Questions
How much water should I filter per person per day?
A common guideline is 2 to 4 liters per person per day for drinking, with more needed in hot weather, high altitude, or strenuous activity, plus extra for cooking and cleaning.
How do I know when to replace my water filter?
Most filters list a rated capacity in liters or gallons. Track cumulative use across trips and replace or service the filter once you approach that limit or notice reduced flow.
Should I bring backup water treatment?
Yes, many backpackers carry a backup method like purification tablets or a UV pen in case the primary filter clogs or fails on a longer trip.