Emergency Water Calculator
Estimate a household water quantity using an editable daily amount. The result is a starting point to compare with official local guidance.
Estimate household water needs
Change the household size, duration or daily planning amount.
This is a planning estimate, not a universal requirement. Needs can vary with climate, age, health, activity, food preparation and local authority guidance. More water may be needed for pets and hygiene.
To keep a copy, select “Print / save as PDF” in your browser’s print dialog.
How the estimate is calculated
People × days × daily amount per person = estimated total water.
The American Red Cross describes one US gallon per person per day as a basic emergency-kit planning amount. Ready72 uses an editable metric equivalent so visitors can adapt it to official guidance in their own country.
For exact recommendations, consult your local civil protection, public health or emergency management authority.