Roof Pitch Calculator

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Convert between roof pitch (x/12), angle in degrees and slope percentage, with rafter length factor and a live diagram.

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Rise

Run

Pitch is expressed as rise per 12 units of horizontal run (e.g. 6/12). The rafter multiplier converts horizontal area to actual roof surface area.

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Runs entirely in your browser. No data is sent to any server.

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update v1.0

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Enter rise and run, an angle, or a pitch value — the other measures, the rafter multiplier and a scale diagram update instantly.

Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.