See what your roof could capture from one storm or a full year, and how many barrels that would fill.
How it works
Roof area × inches of rain × 0.623 gallons, reduced by the share actually captured.
Before you order
- Use the roof footprint, not the sloped surface area.
- Screen openings so mosquitoes cannot breed inside.
- Check local rules, since rainwater collection varies by state.
Common questions
How much water comes off a roof in one inch of rain?
About 623 gallons per 1,000 square feet before losses.
Is rainwater safe to drink?
Not without proper treatment. Use barrel water for gardens.