Gutter Capacity Calculator

Enter your roof dimensions to size the right gutter profile and number of downpipes.

Length of the roof along the eaves the gutter runs.
Horizontal distance from the ridge to the gutter (plan).
Vertical height. Leave 0 for a flat roof.
Use a higher figure for exposed or high-rainfall sites.
Effective roof area—
Required flow—

Recommended gutter

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Guidance only, based on BS EN 12056-3 simplified sizing. For large, complex or commercial roofs confirm with a full rainwater design.

Project Estimator

Pick your profile, enter your run and downpipe drops for a full parts list, then add the lot to your basket in one click.

PartQtyPrice
Estimated total (inc VAT)—

A guide quantity for a straight run. Check angles, outlets and bracket spacing against your actual layout before fitting.