Water Purification Needs Calculator

Treatment capacity from group size and trip length.

Group size

Trip duration (days)

Activity Level

Water Sources

Cooked meals/day

Tab to move between fields

Water/person/day (L)

4.5

Group daily water (L)13.5

Total trip water (L)40.5

Max carry capacity (L)0.7

Recommended method2

Daily filter time (min)14

Chemical doses (backup)41

Filter Capacity Needed40.5

Chemical Bottles Needed1

How to Use This Calculator

Enter group size, trip duration (days), and activity level (light, moderate hiking, or strenuous/hot).
Select water source reliability (abundant, moderate, or scarce spacing between sources) and the number of cooked meals per day.
Read daily water needed per person and per group, plus total water needed for the entire trip.
Review the recommended filter method (squeeze, pump, or gravity) and the estimated daily filtering time.
Check the maximum carry capacity between water sources and the backup chemical doses/bottles needed.

How the result changes with Cooked meals/day

Water/person/day (L): Daily water needs per person including drinking and cooking.
Group daily water (L): Total daily water for the whole group.
Total trip water (L): Total liters of water to filter for the entire trip.
Max carry capacity (L): Recommended water carry between sources (with safety margin).
Recommended method: 1 = Squeeze filter, 2 = Pump filter, 3 = Gravity filter.
Daily filter time (min): Approximate time to filter daily water needs.
Chemical doses (backup): Number of chemical treatment doses for backup purification.

Identify Input Parameters
4 parameters
Group size = 3, Trip duration (days) = 3, Activity Level = 2, Water Sources = 1 = 5 input(s) provided
Calculate Water/person/day
Water/person/day = baseWaterLPerDay + cookingWater
4.5 = 4.5
Calculate Group daily water
Group daily water = dailyWaterPerPerson * groupSize
13.5 = 13.5
Calculate Total trip water
Total trip water = dailyGroupWater * tripDays
40.5 = 40.5