An emergency water storage calculator helps estimate how much water your household should store for disasters, power outages, or emergencies. Preparedness experts commonly recommend storing at least one gallon of water per person per day for drinking and sanitation. Use the calculator below to determine how much emergency water your family should store based on household size and the number of days you want to prepare for.
Emergency Water Storage Calculator
Use the calculator below to estimate how much water your household should store for emergencies.
Enter:
- Number of people in your household
- Number of pets
- Number of days you want to prepare for
The calculator will estimate the total amount of water needed based on the commonly recommended guideline of 1 gallon (1 litre) of water per person per day.
Why Water Storage Is Critical for Emergency Preparedness
Water is one of the most essential resources during emergencies. Natural disasters, severe storms, infrastructure failures, and power outages can interrupt access to clean drinking water.
Without a reliable water supply, households may struggle to meet basic needs such as drinking, cooking, and sanitation.
Building an emergency water supply helps ensure your family can remain safe and comfortable during short-term disruptions or longer emergencies.
Preparedness experts often recommend storing at least three days of water, although many households choose to prepare for two weeks or longer.
How Much Water Should You Store for Emergencies?
A common preparedness guideline is:
1 gallon = 3.785411784 liters of water per person per day
This amount includes:
- Drinking water
- Cooking water
- Basic sanitation needs
Example:
Family of 4 preparing for 14 days
Water needed:
56 gallons = 211.9830599 liter
However, some households may need additional water depending on:
- hot climates
- medical needs
- children or pets
- physical activity levels
Using a water storage calculator helps estimate your household's specific needs.
Best Ways to Store Emergency Water
When building an emergency water supply, it is important to store water safely and use proper storage containers.
Common water storage options include:
- Food-grade water storage containers
- Large water barrels
- Bottled water
- Stackable water containers
Store water in a cool, dark location away from chemicals or direct sunlight.
It is also recommended to periodically rotate stored water to maintain freshness.
Start Building Your Emergency Water Supply
Preparing for emergencies does not need to happen all at once. Many families gradually build their emergency supplies over time.
Start by calculating how much water your household needs using the calculator above, then begin storing water in safe containers so your family is better prepared for unexpected situations.
More Emergency Preparedness Calculators
Emergency preparedness involves planning both food and water supplies. These related calculators can help you estimate your household's total emergency preparedness needs.
Food Storage Calculator
Calculate how much emergency food your family should store for short-term or long-term preparedness.
Food Supply Duration Calculator
Estimate how long your existing food storage will last during an emergency.
FAQ Section
Q: How much water should you store per person for emergencies?
A: Preparedness experts commonly recommend storing at least one gallon of water per person per day. This amount includes water for drinking, cooking, and basic sanitation during emergencies.
Q: How many days of water should you store?
A: Emergency preparedness guidelines recommend storing at least three days of water, but many households choose to prepare for one to two weeks or longer, depending on their preparedness goals.
Q: How do you store water for long-term emergencies?
Q: Water should be stored in food-grade containers or sealed bottled water. Containers should be kept in a cool, dark location away from chemicals and direct sunlight.
Q: Can you drink stored water after a long time?
A: Stored water can remain safe for long periods if it is kept in sealed, food-grade containers. It is generally recommended to rotate stored water periodically to maintain freshness.
Q: What is the best container for emergency water storage?
A: Food-grade water containers, water storage barrels, and commercially bottled water are among the most reliable options for storing emergency drinking water.
