Rain Barrel Savings Calculator

Estimate water savings and cost reduction from rain barrels.

Roof Area (sq ft)

Annual Rainfall (in)

Number of Barrels

Water Rate ($/1000 gal)

Formula

Gallons = Roof Area x Rainfall x 0.623

How much water can a rain barrel collect?

A 55 gallon barrel can fill up in a single moderate rainstorm.

Are rain barrels worth the investment?

Yes, they can save $50 to $200 per year depending on water rates.

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