Roof Pitch Calculator
Calculate roof pitch, angle, and rafter length
Input Measurements
Vertical rise per 12 inches of run
Horizontal run (typically 12 inches)
Horizontal distance from eave to ridge
Common Pitches
3:12 - Low slope
4:12 - Minimum for shingles
6:12 - Standard residential
8:12 - Steep slope
12:12 - 45° angle
Results
Pitch Ratio
6:12
Roof Angle
26.57°
Slope Percentage
50.0%
Rafter Length
26.83 feet
Per 12": 13.42 inches
Pitch Factor
1.118
Multiply base area by this factor
High Slope (6:12 to 9:12)
Recommended: Any roofing material
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.