Emergency Stock Calculator
Set your household size and the number of days to see the supplies you need and what is still missing.
Everything runs locally in your browser. Nothing is sent to the server.
On hand
Supply check
Drinking water
- Needed
- 18 L
- On hand
- 0 L
- Still needed
- 18 L
Meals
- Needed
- 18 meals
- On hand
- 0 meals
- Still needed
- 18 meals
Emergency toilets
- Needed
- 30 uses
- On hand
- 0 uses
- Still needed
- 30 uses
The starting values are a simple planning estimate. Adjust them to match your household and local guidance.
What it does
Estimate the amount of water, food, and emergency toilet capacity your household may want to keep for a few days. Enter what you already have to see the remaining amount at a glance.
How to use it
- Enter the number of people and days you want to prepare for.
- Adjust the per-person assumptions and enter the supplies you already have.
- Check the shortfall for each item and use it as a shopping list.
Tips
- The default water estimate is 3 L per person per day.
- This is a planning aid, not an official emergency instruction.
- All values stay in your browser.
FAQ
Are the default amounts official requirements?
No. They are editable starting values to help you make a household plan. Follow local government and emergency guidance for your area.
Is my household information uploaded?
No. The calculation happens entirely in your browser.
Can I use it for more than three days?
Yes. Change the number of days and the totals update immediately.