💧 Water Tank Sizing Calculator

No shower: 2-3 gallons/person/day
With shower (navy style): 5-6 gallons/person/day
Full shower (normal): 8-10 gallons/person/day
Pro tip: 1 gallon of water weighs 8.34 lbs - plan your weight budget!

How many gallons of freshwater do you REALLY need for van life?

👥 Number of people

📅 Days between water fills

🚿 Includes indoor shower (adds 2.5 gal/person/day)

🍳 Heavy use (dishwashing, cooking, pets - adds 1 gal/person/day)

💧 Daily water usage: -

🚰 Freshwater tank needed: -

🪣 Grey tank needed (80%): -

📦 Tank weight when full: -