Gutter Calculator
Calculate the number of gutters, connectors, and downspouts needed for your roof.
Supports feet and meters.
Gutter Materials Needed
Gutter estimation is based on the total roof edge length and downspout spacing.
Imperial (feet):
Gutter sections = ceil(Roof Edge Length / Section Length)
Standard gutter sections are 10 feet long.
Connectors = Gutter sections - 1 + Corners
Downspouts = ceil(Roof Edge Length / Downspout Spacing)
Metric (meters): Standard gutter sections are 3 meters long. Same formulas apply.
Recommended downspout spacing:
- Every 20 feet (6 m) for light rainfall areas
- Every 30–40 feet (9–12 m) for standard installations
Standard gutter sizes:
- 5 inch (125 mm) — Most residential homes
- 6 inch (150 mm) — Large roofs or high rainfall areas
Tips:
- Add end caps (2 per gutter run unless connected to another run)
- Include gutter hangers every 2–3 feet (60–90 cm)
- Plan for slope of 1/4 inch per 10 feet toward downspouts