Household Preparedness Calculator

Your goal

Goal in days

3 is UK advice. 7 and 10 follow Nordic and German advice.

Each category

Expired or due soon

What to store

Item	Target	You hold	Still to get

Build up gradually. Start with what you already have at home, then add a little with each shop.

How these figures are worked out

Add an item

My stock

Keep your plan safe

Your plan is saved in this browser. Save it as a spreadsheet as well, so you can edit it in Excel, keep it with your other papers, or open it on another phone.

Kit and supplies

Tick what you have. Add the amount and a use-by date where it matters, for example cash or batteries. Everything you tick also appears in Stock and in your saved plan.

Your household

Number of people

Everyone counts the same: 3 litres of drinking water each per day, as UK Be Ready advises.

How many days do you want to be ready for?

3 days (UK advice) 7 days 10 days Other

3 days: UK Be Ready. 7 days: Norway and Sweden. 10 days: Germany.

Use 5 litres per person per day instead of 3
UK advice is 3 litres for drinking and says you’ll need more for food and cleaning. Sweden advises 3 to 5 litres. Someone takes regular medicine
We’ll track how many days of supply you hold. Don’t stock up beyond your prescription; ask your pharmacist about keeping a small extra supply.

Pets

Enter what each pet eats and drinks in a day. Check the feeding guide on the pack, or ask your vet.

Care needs

There is a baby in the household
Adds formula, nappies and feeding equipment to your kit. Someone relies on medical equipment that needs power

Gas

I’ll cook on a gas camping stove (outdoors) I have a portable gas heater

Start again

Clears your household, stock and ticks from this device.

What this tool is

A free planner to help a household work out what to store for a power cut, loss of tap water, or loss of shops and services. It follows the UK government's 2026 advice to be ready for three days, and draws on Nordic and European guidance, where household readiness advice is more developed.

It works offline, needs no account, and keeps your data on your own device. Nothing is sent anywhere.

Where the figures come from

Source	Period	Water
UK Be Ready	3 days	3 L per person per day, drinking
Finland (72 Hours)	3 days	At least 5 L bottled per person
Denmark and EU	3 days	3 L per person per day, drinking and food
Sweden (Krisinformation)	1 week	3 to 5 L per person per day
Norway (DSB)	1 week	About 20 L per person per week
Germany (BBK)	Up to 10 days	2 L per person per day
US FEMA	3 days	About 3.8 L per person per day

Figures the tool uses

Water: 3 L of drinking water per person per day (UK Be Ready), or 5 L if you choose (Sweden).
Goal: 3 days (UK), with 7 and 10 days as options from Nordic and German advice.
Check your supplies every six months (UK Be Ready).
Replace water you have bottled yourself every six months (Ready.gov). Bought water follows its date.
Expired items are not counted.

Figures you enter

No government gives a figure for these, so the tool asks you rather than guessing: how many days your food will last, days of medicine, what your pets eat and drink, and how much gas your stove or heater uses.

If your heater label shows only its power in kW, the tool estimates gas use at about 79 g of butane per kW per hour. This comes from butane’s energy content (about 12.6 kWh per kg, Engineering Toolbox). It is an estimate, not advice.

Please note

This is a planning aid, not official advice. Always follow instructions from the emergency services and your local council. For medicines, speak to your GP or pharmacist. Follow the maker’s instructions for any heater or stove, and read the NHS advice on carbon monoxide.