Rain Gutter Sizing Calculator
Full version ↗
Roof Edge Length (feet)
Roof Depth/Width (feet)
Roof Pitch
Low (flat to 4/12)
Medium (4/12 to 8/12)
Steep (8/12 to 12/12)
Max Rainfall Intensity
Light (2"/hr — dry climate)
Moderate (4"/hr — average)
Heavy (6"/hr — southeastern US)
Extreme (8"/hr — tropical/hurricane zone)
Calculate
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Recommended Gutter Size
Downspouts Needed
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Water Flow Rate
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