Estimate freshwater needs for camping, RVs, camper vans, cabins, boats, base camps, and off-grid trips. Calculate daily water use, total trip water, tank runtime, drinking water, cooking water, dishwashing, handwashing, showers, pets, and reserve capacity.
Daily use:
The calculator adds drinking, cooking, dishwashing, handwashing, toilet flush water, and pet water to estimate daily freshwater use.
Trip total:
Daily use is multiplied by trip length, then shower water and reserve water are added to estimate total freshwater needed.
Tank runtime:
If you enter a freshwater tank size, the calculator estimates how many days the tank may last at the calculated usage rate.
A freshwater usage calculator helps plan RV trips, camper van water storage, cabin water tanks, boat water use, base camp supply, and off-grid camping needs.
Real water use depends on weather, personal habits, shower length, dishwashing method, water pressure, pets, leaks, tank accuracy, and whether you use disposable dishes or public facilities.
This calculator uses a practical off-grid water planning formula:
Total Water Needed = Daily Water Use × Trip Days + Shower Water + Reserve Water
For basic camping, many people plan around 3 to 5 gallons per person per day. Conservative use can be lower, while showers and hot weather can make it much higher.
Divide your tank capacity by daily water use. A 40 gallon tank using 10 gallons per day may last about 4 days before reserve water is considered.
Yes. Even short RV showers can use several gallons each, so shower habits can make a big difference in tank runtime.
Yes. Reserve water is important for hot weather, longer trips, route delays, pets, cooking mistakes, leaks, or emergencies.