How we worked it out
Updated as you change the numbers.
- Sections = eave length ÷ section length. Downspouts = length ÷ length per downspout, at least one per run. Hangers = length ÷ spacing, plus one per run.
Method and assumptions
Gutters need a downspout for roughly every 30 to 40 ft (more for steep or large roofs and heavy rain) and hangers every 24 in, or closer in snow country. Each run has two ends, less any that turn a corner.
Questions
How many downspouts for 120 ft of gutter?
About 4, one per 35 ft.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.