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Water calculator
UK Government guidance uses 3 litres of drinking water per person per day for three days. Add an editable planning allowance for cooking and hygiene if you have room. Pet quantities are not included because needs vary; ask your vet.
How this works
The result is a planning aid based only on the values you enter. Check official guidance and adapt it to your household. The estimate does not replace advice from a clinician, pharmacist, supplier or vet.
Useful next steps
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Frequently asked questions
Is this a precise prediction?
No. It is a planning estimate based on the values entered and the assumptions shown on this page.
Does my information leave this device?
Tool inputs are processed in your browser. The postcode tool does not send a postcode anywhere.
Where can I get current advice?
Follow the official sources linked from this page and seek specialist advice where relevant.