Water storage calculator
Set a practical emergency water target.
Start with one gallon per person per day, then adjust for pets, sanitation, climate, activity, and health circumstances.
Build your estimate
The baseline is one gallon per person per day. Your entries stay in this page and are not sent to the server.
Whole numbers from 1 to 50.
Plan from 1 to 30 days.
Used as a reminder only; set their total allowance below.
Adjust for species, size, climate, health, and veterinary guidance.
Add water for basic sanitation or circumstances beyond drinking.
Your planning target
Water storage estimate
3 gallons
Approximately 11.4 liters
- Suggested minimum
- 3 gal
- Stretch target
- 4.5 gal
People plus your entered pet allowance.
Includes your extra allowance, or a planning suggestion of 0.5 gallon per person daily when none is entered.
Container equivalents
- 31-gallon containers
- 22.5-gallon containers
- 15-gallon containers
Assumptions used
- 1 person for 3 days at one gallon per person daily.
- 0 pets with 0 gallon total pet allowance daily.
- 0 gallon additional household allowance daily.
Storage checklist
- □ Use appropriate food-grade water containers.
- □ Store containers in a suitable, protected environment.
- □ Inspect and rotate water according to the container maker and current official guidance.
- □ Keep drinking water needs distinct from sanitation needs.
- □ Adjust for climate, activity, pregnancy, health, and medical circumstances.
This is a planning estimate, not a guarantee for every emergency. Pet and household needs vary. Consult current local emergency guidance and appropriate medical or veterinary professionals for circumstances specific to you.