Water Tank Size Calculator
Find the fresh water tank size for your trip length.
About the Tank size calculator
Use this water tank size calculator for van life water system planning. Find the fresh water tank size for your trip length.
Enter your tank size details
Extra capacity for guests, hot weather, longer stays.
A typical 3-min low-flow shower is 15–20 L.
Your tank size results
Per person / day
18 L
Daily total
36 L
2 people
Recommended tank
216 L
≈ 57 US gal
Why tank size matters for van life water system planning
Plan with confidence
Getting your tank size numbers right early avoids costly rework, undersized components and surprises on the road.
Related water tools
Pair this with the rest of our water calculators to plan your full van conversion.
Tank size calculator FAQ
- What does the Water Tank Size Calculator do?
- Find the fresh water tank size for your trip length. It is designed for van life water system so you can plan with confidence.
- Is the tank size calculator free to use?
- Yes. All VanTools calculators, including the Water Tank Size Calculator, are free to use with no sign-up required.
- How accurate are the tank size results?
- Results are estimates based on the values you enter and standard van life water system assumptions. Always sanity-check against manufacturer data and your real-world conditions.
- Can I share or save my tank size calculation?
- Yes. Use the Share button to copy a link that includes your inputs, or use Export to download a PDF or image of your results.