Tool
Supplies calculator
How much water and food your household needs, based on how many of you there are and how many days you want to cover. Your data never leaves your browser.
How we calculate
- Water: 1 gallon (about 4 liters) per person per day, the standard reference in expert guides: 2 to 3 liters for drinking and the rest for cooking and basic hygiene. In hot weather, an extra liter.
- Pets: about 1 fluid ounce per pound of body weight per day. A medium dog needs around a third of a gallon and a cat about a cup.
- Food: 2,000 calories per adult and 1,400 per child per day.
- Weight: estimated at about 2 calories per gram, the average of a pantry that mixes canned food, heavy because of its water, and dry goods like rice, pasta or nuts.
| People | 3 days | 1 week | 2 weeks | 1 month |
|---|---|---|---|---|
| 1 | 3 gal | 7 gal | 14 gal | 30 gal |
| 2 | 6 gal | 14 gal | 28 gal | 60 gal |
| 3 | 9 gal | 21 gal | 42 gal | 90 gal |
| 4 | 12 gal | 28 gal | 56 gal | 120 gal |