TOOLS
Calculators
Tools for turning the numbers in our articles into your own household's numbers. Each one pairs with an evergreen guide and uses the same primary sources.
Household stockpile calculator
Enter the number of people and days to get drinking and cooking water, meals, and gas canisters.
Open the calculatorBattery capacity calculator
Convert mAh to Wh, count phone charges, and add up the Wh your devices need during a power cut.
Open the calculator