Interactive Rainwater Collection Calculator
How Much Rainwater Can You Collect?
Enter your roof area and rainfall amount to estimate your rainwater harvesting potential.
SQ. FT.
INCHES
Estimated Rainwater Collection
0
gallons
Enter your roof area above to calculate your collection potential.
1" OF RAIN ON 1,000 SQ. FT. OF ROOF = APPROXIMATELY 623 GALLONS
Don't Know Your Roof Area?
Calculate Length × Width
Enter the approximate length and width of your roof collection footprint.
×
Roof Collection Area:
0 sq. ft.
FORMULA
Roof Area × Rainfall × 0.623 = Gallons