Water Purification Calculator

Calculate emergency water purification needs by household size, duration, and purification method.

Number of people

Duration (days)

Drinking water (gal/person/day)

Sanitation water (gal/person/day)

Purification method (0-4)

Tab to move between fields

Total water needed (gal)

Total water needed (L)211.96

Daily drinking water (gal)4

Daily total water (gal)8

Purification supply needed0.02

5-gal containers needed12

Supply DescriptionLiters of 8.25% unscented sodium hypochlorite bleach

Supply LabelBleach needed (liters)

How to Use This Calculator

Enter Number of People and Duration (days) of the emergency event.
Set Drinking Water (gal/person/day) — minimum is 0.5 gallons, 1 gallon recommended.
Enter Sanitation Water (gal/person/day) for hygiene and cooking.
Select Purification Method (boiling, chlorine tablets, filter, UV, or mixed).
Review Total Water Needed (gallons and liters) and purification material quantities needed.

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