The standard size of residential gutters is 5 inches, but homeowners can choose 6-inch gutters instead. While traditional 5-inch gutters are a common choice among homeowners, 6-inch gutters can hold much more water. If you choose K-type gutters for a roof area of less than 5,500 square feet, the recommendation is a standard 5-inch gutter size. For roof areas between 5,500 and 8,000 square feet, a 6-inch gutter is recommended.

These calculations of the area, plus the slope and the amount of rain you expect to receive, influence the size of the gutters and the number of downspouts you will actually need. To figure out the size of gutters you need, you'll first need to calculate the square footage of the gutter's drain area. You can also use traditional-sized gutters if you ask a professional to increase the inclination of the gutters during installation to increase capacity. When you complete the replacement of a gutter, the first point to keep in mind is that gutters come in different sizes.

However, if you want to install a completely new gutter system, you'll need to take some measurements on the roof to understand which gutter size is best. To calculate the size of the gutter you need, you can calculate the square footage of the gutter's drain area.