Home72

Emergency water calculator

Enter how many people live at home and how many days you want to be ready for. Everything runs in your browser.

36litres of water for drinking and cooking · 24 bottles of 1.5 L
18litres minimum for drinking only
2charged power banks
1spare set of batteries for each torch and the radio

3 litres per person per day for drinking and cooking; 1.5 litres minimum for drinking only. Power banks and batteries are our practical tip: one power bank for every two phones.

Keep it up to date with Home72

Home72 works out what your home needs, reminds you before anything expires and tells you the one next step. No account, works offline.

Coming soon to the App Store

Sources

  • National guidance in Denmark, Sweden, Switzerland and the UK — 3 litres per person per day. Based on national public guidance (not official material).
  • Protecció Civil, Generalitat de Catalunya — 72-hour emergency kit campaign (2026). Based on figures from Protecció Civil de Catalunya (not official material).
  • European Commission — Guidelines on Population Preparedness, 30 October 2026. © European Union, 2026, licensed under CC BY 4.0 — adapted (translated and shortened).

Based on public guidance, in our own words. Not an official app. Always follow instructions from local authorities.