Work out survival water requirement instantly with clear inputs, formula shown and shareable results.
Emergency guidance is about one gallon or 3.8 litres per person per day covering drinking and basic sanitation, and water weighs one kilogram per litre. The weight figure is what makes the plan realistic: a week for four people is over a hundred kilograms, so storage location matters as much as quantity.
Water needed
litres = people x days x litres per person per day
litres = people x days x litres per person per day. Emergency guidance is about one gallon or 3.8 litres per person per day covering drinking and basic sanitation, and water weighs one kilogram per litre.
The weight figure is what makes the plan realistic: a week for four people is over a hundred kilograms, so storage location matters as much as quantity.
Enter number of people, days to prepare for, water per person per day, container size. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.