Roof pitch calculator
pitch = rise / run (inches per 12)
- Pitch ratio
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- Angle
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- % slope
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- Category
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Low slope < 4/12 (often needs different roofing). Standard 4/12–9/12. Steep 9/12+.
About this tool
Roof pitch calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
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