Roof Pitch Calculator
Convert between rise/run pitch, angle in degrees, and percentage — and get the rafter length multiplier for your roof.
Roof angle (°)
26.57
Detalhamento
- Pitch (rise per 12)
- 6
- Slope (%)
- 50
- Rafter multiplier
- 1.12
- Rafter length (m)
- 5.59
- Classification
- Conventional
Última atualização:
FAQ
What does a 6/12 pitch mean?
The roof rises 6 units for every 12 units of horizontal run — a 26.57° angle, about 50% slope. It is one of the most common residential pitches in North America.
How do I calculate rafter length?
Rafter = run ÷ cos(angle), or run × multiplier where multiplier = 1/cos(θ). A 6/12 pitch has a multiplier of about 1.118, so a 5 m run needs a 5.59 m rafter (before any eave overhang).
What pitch is too steep or too flat?
Below 2/12 (≈9.5°) most shingle warranties are void and standing-seam metal or membrane roofing is required. Above 9/12 (≈36.9°) many crews charge a steep-roof premium and require harnesses.
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