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Sizing Your Rainwater System

How much rainwater can I collect?

Water consumption can vary widely due to different factors such as water usage for washing or bathing. This calculator will help you gauge how much water you can collect off your roof, and is not an indication of how much water you will use.

Click Here to Calculate your water footprint.


Annual Rainwater Volume Calculator

  1. Determine Roof Area, using plan footprint not sloped area.
    Example: W x L = Footprint (add any overhangs to this figure)
  2. Determine Annual Rainfall
  3. Determine Collection Potential, Annual Rainfall ( in.) x Roof Area (in ft2) = Gallons collected annually.
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Contact us for a customized recommendation for your property.