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Roof Pitch Calculator
Convert roof rise and run to pitch (x/12), angle in degrees, slope percentage and rafter multiplier.
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How to use this calculator
Enter your values after choosing the type of calculation in the tabs. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
Roof pitch basics
Pitch is the rise in inches for every 12 inches of horizontal run. A 6/12 roof rises 6 in per foot, an angle of 26.57°. Common pitches: 4/12 (18.4°), 6/12 (26.6°), 8/12 (33.7°), 12/12 (45°).
angle = arctan(rise ÷ run)
multiplier = √(1 + (rise ÷ run)²)
Shingle manufacturers specify minimum pitches; check the product requirements and local code.
Frequently asked questions
What angle is a 4/12 roof?
About 18.43°.
About this tool
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- Formula tests passed · human review pending
- Last updated
- 31 Oct 2026
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