Gutter Length Calculator
Work out gutter length and downspout count for a roof edge.
Quick answer: enter your details below and click Calculate Gutters — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Measure the total eaves length in metres.
- Enter the planned spacing between downspouts.
- Click Calculate Gutters.
About this tool
Enter the total eaves length and the spacing between downspouts, and the tool gives the gutter length with a 5 percent allowance for joins and the number of downspouts. The allowance is shown separately.
Frequently asked questions
Can one downspout serve a long run?
Only for short runs. Long runs need more downspouts or the gutter overflows in heavy rain.
Does gutter size matter?
Yes, larger roofs need larger gutters and downspouts to handle the flow.