Tools / water calculator

Water-storage calculator

How much water your household needs, the containers to hold it, and when to replace it. See the Water guide for storing and treating it.

Find preparedness resources by state. Calculator quantities depend on your inputs, not state boundaries.

People

Pets: total weight in pounds

Add up your animals, for example a 35 lb dog and a 10 lb cat = 45. Use 0 for none.

Days

Aim for at least 14 days (two weeks).

Climate

Normal Hot (summer heat, desert, tropics)

Filled on (for containers you fill yourself)

Calculate

Sources

1. Food and Water in an Emergency · FEMA · checked 2026-09-21
2. Water · Ready.gov (FEMA) · checked 2026-09-21
3. Water During Emergencies (water storage calculation, including pets) · Island County (WA) Department of Emergency Management · checked 2026-09-21