Emergency Water Supply Calculator

Estimate how much emergency water your household may need for drinking and basic hygiene.

Total number of people.
How many days you want to prepare for.
More hygiene water = higher total.
How we calculate

We use a simple per-person daily water estimate. Basic covers drinking only, standard adds minimal hygiene, and extended includes a larger safety margin.

  • Basic: 3 liters per person/day
  • Standard: 5 liters per person/day
  • Extended: 7 liters per person/day