SMACNA Gutter Calculator Basic Calculator Advanced Calculator Enter the required details to calculate the gutter dimensions Gutter Length (ft) Gutter Width (in) Downspout Size (in) Flow Rate (gpm) Gutter Area (sq ft) Roof Area (sq ft) Rainfall Intensity (in/hr) Runoff Coefficient Gutter Area (sq ft) Calculate Reset Enter your gutter dimensions and other necessary details […]