Water-Calculator
"You may be surprised by the significant amount of rainwater that can be collected from your own roof"
How Much Rainwater Can You Collect?
Struggling to decide which tank suits your needs? Utilise our rain catchment calculator and water usage calculator to simplify your choice!
Rainwater Collection Calculator
We have created the rainwater collection calculator below to assist you with understanding the rainwater collection opportunity you have and to assist you in sizing an optimal rainwater collection tank size for your situation.
In the calculator below, choose your state and then choose your city. If you city isn’t listed, please choose a city that is closest to you.
Then you need to enter the amount of roof area that you will be collecting from. If you don’t know how to calculate the roof collection area, see the explanation section below the calculator.
After you hit “Calculate”, you will be presented with the Total Annual Rainwater Collection Volume, in gallons, along with a graph showing the amount of rainwater you would collected on a monthly basis. These monthly volumes are calculated using the monthly average rainfall amounts for your area.
Try it for yourself!
