Gutter & Downspout Calculator
Size gutters and downspouts based on roof area and rainfall intensity.
Roof Area (sq ft)
Rainfall Intensity (in/hr)
Roof Pitch
Flat (up to 3:12)
Low (4:12 to 5:12)
Medium (6:12 to 9:12)
Steep (10:12+)
Gutter Size
5-inch
6-inch
Calculate