Roof Pitch Calculator
Convert rise and run into angle, slope and pitch factor, then estimate gable-rafter length and roofing area.
What Is the Roof Pitch Calculator?
The Roof Pitch Calculator converts rise and run into roof angle, slope percentage and pitch factor. For a symmetrical gable roof it also estimates horizontal run, common-rafter length, roof surface area and waste-adjusted roofing squares.
How It Works
Enter the pitch rise and run plus building span, length and overhang. Add the waste allowance appropriate for the planned roofing and use the geometry takeoff for preliminary material planning.
When to Use It
Use it for basic symmetrical gable-roof geometry. Hips, valleys, dormers, unequal slopes, structural sizing, ridge details and local loads require project-specific drawings and code review.
Frequently Asked Questions
- What Does A 6 In 12 Pitch Mean?
- The roof rises 6 inches for every 12 inches of horizontal run.
- What Is A Roofing Square?
- One roofing square covers 100 square feet of roof surface. Product bundles per square vary by manufacturer and product.
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