Roof Pitch Calculator
Calculate roof pitch, angle, and pitch factor
Vertical rise in inches
Horizontal run (standard: 12")
Pitch Ratio
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Angle
—
degrees
Slope
—
%
Pitch Factor
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How to Use This Calculator
Roof pitch affects everything from material quantities to walkability and cost. Our calculator converts between rise/run ratios, degrees, and pitch factors.
- Measure the rise over a 12" run
- Enter the rise and run
- Use the pitch factor to calculate actual roof area
AI Insights
Smart analysis for your project
Smart Estimates
Our AI cross-references material costs, regional pricing, and project complexity for more accurate estimates.
Waste Optimization
AI-calculated waste factors based on project type, not flat percentages. Saves 5-15% on material costs.
Best Practices
Recommendations derived from building codes, contractor data, and thousands of completed projects.
Calculation Formula
Angle = arctan(Rise / Run)
Percentage = (Rise / Run) x 100
Pitch factor = sqrt(Rise^2 + Run^2) / Run
Frequently Asked Questions
What is a standard roof pitch?
Standard residential roof pitches range from 4/12 to 9/12. A 6/12 pitch is most common. Low: 2/12-4/12, medium: 4/12-9/12, steep: 9/12+.
What roof pitch is walkable?
Roofs with a pitch of 6/12 or less are generally walkable. Anything steeper than 7/12 requires special equipment.
How do I measure roof pitch from the ground?
Measure 12 inches up from the edge (run), then measure the vertical distance to the roof surface (rise). Rise/run = pitch ratio.