Estimate how much fresh water to carry, how quickly your gray tank fills, and what the fresh water adds to the van’s loaded weight.
Camper Van Fresh & Gray Water Tank Calculator
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How it works
Add per-person drinking, dishwashing, and shower use plus water shared by the group. Multiply by days and add a fresh water reserve. Gray water is the share of regular water use that actually drains into its tank. The weight uses about 8.33 pounds per U.S. gallon.
Reference: U.S. Geological Survey water weight and density.
What to check before you use the result
Adjust the gray water share for water you drink, cook with, or use outside. The weight covers water only; add the tank and mounts when checking payload.
