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Roof pitch calculator
Roof slope in degrees, percent and rise-over-run, with rafter length.
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About Roof pitch calculator
Convert between roof slope expressed as rise over run, degrees and percent, and find rafter length. A 6 in 12 pitch means 6 inches of rise for each 12 inches of run, about 26.6 degrees. Rafter length comes from the Pythagorean theorem using the run and the rise.
How to use Roof pitch calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
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Frequently asked questions
What angle is a 6 in 12 roof pitch?
About 26.6 degrees, equal to a 50 percent slope. Each 12 inches across the roof rises 6 inches.
Is Roof pitch calculator free?
Yes. Roof pitch calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.