Campervan Water Autonomy Calculator
Estimate how long your fresh water lasts based on tank size, people, and usage style. Fast, practical presets for real vanlife.
What do the “Frugal / Normal / Comfort” presets mean?
They’re real-world litres per person per day: ~15 L (Frugal), ~25 L (Normal), ~40 L (Comfort). Pick what matches your habits; you can change it any time to see the impact.
Should I include jerry cans in the tank size?
Yes—if you actually draw from them between refills. Only count water you truly use before the next resupply.
My grey tank fills first—what now?
Reduce water use, empty grey more often, or size the grey tank closer to your **fresh × share to drains**. See the **Waste Tank Size Calculator**.
How can I stretch autonomy without adding tanks?
Shorter showers, dish-pan method, trigger nozzles, and switching from **Comfort → Normal/Frugal** can add 1–2 extra days easily.
Does this consider a water toilet?
Indirectly via the presets. If you flush with fresh water, choose **Comfort** or bump your per-person litres.