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How long can you last?
Put in who lives in your home and what you already have. It shows what you need for the days you choose, and which supply runs out first.
This runs entirely in your browser. Nothing you type is stored or sent anywhere.
Your numbers
| You need | You have | Short by |
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What would close the gap
How the numbers are worked out
- Water: 4 litres (about 1 US gallon) per person per day, for drinking, simple food preparation and a little hygiene. Dogs are counted at 1 litre a day and cats at a quarter litre. This does not include flushing, bathing or laundry. Add more for hot weather, illness, pregnancy or nursing.
- Food: three meals and about 2,000 calories per person per day. People working in the cold need more.
- Power: typical figures for each device, added up per day. A battery delivers about 85 percent of its rated watt-hours. Your own devices may differ, so check their labels. This assumes the battery is not being recharged.
These are planning estimates for an average household, not a guarantee. If someone in your home relies on a medical device or a refrigerated medicine, plan that separately with the people who supply it. See medicines and devices.
Sources
Official guidance this page was checked against. If your local authority says something different, follow them.