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
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degrees
Slope
—
%
Pitch Factor
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Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.
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.