Work out emergency kit sizing instantly with clear inputs, formula shown and shareable results.
Water follows the 3.8 litres per person per day guidance, food is sized by energy and converted at about 3,500 kcal per kilogram of shelf stable food, plus 1.5 kg of sundries per person. Total kit weight decides whether a kit is a grab bag or a stored cache, and a three day kit for four is already too heavy to carry far.
Water
litres = people x days x 3.8
Food weight
kg = people x days x kcal per day / 3500
litres = people x days x 3.8. Water follows the 3.8 litres per person per day guidance, food is sized by energy and converted at about 3,500 kcal per kilogram of shelf stable food, plus 1.5 kg of sundries per person.
Total kit weight decides whether a kit is a grab bag or a stored cache, and a three day kit for four is already too heavy to carry far.
Enter people in the household, days of self sufficiency, energy per person per day. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.