Enjoy our calculators? Buy us a coffee

Roof Drainage & Gutter Size Calculator

Recommend gutter size and downspout count from roof area and rainfall.

ft²
in/hr

Recommended Gutter Size

5-inch K-style

Effective Area

2,000 ft²

Downspouts Needed

3

Roof Area

2,000 ft²

Rainfall Intensity

5.00 in/hr