Gutter and downpipe calculatorPro
Estimate gutter, downpipes and fixings from the total eave length.
Your measurements
How it's worked out
Gutter = eave length + 5%. Downpipes = eave length ÷ maximum spacing, at least one per run. Brackets at your chosen spacing plus one per run. Two stop ends per gutter run. Check downpipe sizing with your plumber.
Estimates only. Check sizes, coverage and quantities with your supplier, engineer or certifier before ordering. Standards references are a guide, not compliance advice.
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