This downpipe count reference table shows the downpipes needed for a range of roof area values, assuming an area per downpipe of 50 m². Every figure is computed with the same engine that powers our Downpipe Count Calculator, so the numbers are exact.
| Roof area | Downpipes needed |
|---|---|
| 25 m² | 1 |
| 50 m² | 1 |
| 75 m² | 2 |
| 100 m² | 2 |
| 150 m² | 3 |
| 200 m² | 4 |
| 300 m² | 6 |
| 500 m² | 10 |
| 700 m² | 14 |
| 1,000 m² | 20 |
How to use this table
Find the row closest to your roof area and read across to the downpipes needed. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Downpipe Count Calculator for a precise answer.
Need a value that is not in the table? — the Downpipe Count Calculator does it instantly, for free, with the formula and a worked example built in.
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