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Gutter Length Calculator

Linear metres of gutter for a roof perimeter.

Estimate the linear metres of gutter and number of downspouts needed for a rectangular roof from its dimensions.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

m
m

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Gutter ≈ roof perimeter (front + back + half of each side). One downspout per ~10 m of gutter.

In depth

Estimate the linear metres of gutter and number of downspouts needed for a rectangular roof from its dimensions.