Rainfall Harvest Calculator

To estimate how many gallons of water you can collect, enter the dimensions of your roof, including only the section that drains into your barrel. Then, add the amount of rainfall in inches.

Length: ft.       Width: ft.       Rainfall: in.

Rain Barrels

Our popular rain barrels include the 75-gallon Deluxe Rain Barrel and the decorative Rainwater Urn, in two sizes. Connect two rain barrels for maximum storage and use natural rain water in your garden.

IF YOU get about 10-inches of rain over the course of the spring and summer, an average, 1,360-square-foot roof would yield 8,160 gallons of rainwater. You have to admit that whether you're in a drought situation or not, it's hard to pass up that much of a free thing.

When you look at the numbers, it's surprising how much water you can collect every time it rains. Just a half inch of rain falling on a 1,000-square-foot roof will yield 300 gallons of water. To get an idea how much water the roof of your own house might yield, use the Rainfall Harvest Calculator, above.

To learn more, read our Rain Barrel How-To