Gutters come in several sizes and shapes called profiles. The most common type of gutter used today is the open gutter, which Isbell Services runs each piece needed in a continuous roll-formed seamless gutter.
Most residential gutters come in two sizes-- 5" and 6" --and are made of either aluminum, steel, zinc, vinyl, or copper in a standard "K" style.
The typical 5 inch K-style gutter comes with 3 x 4 inch downspouts. A larger residential gutter system would consist of 6 inch K-style gutter using a 3 x 4 inch downspout.
One foot of 5" K-Style gutter holds 1.2 gallons of water. One foot of 6" K-Style gutter holds 2.0 gallons of water. For commercial applications, box gutters, can be made in 7, or 8 inches or even larger custom sizes that hold even more water.