Convert between roof pitch, slope angle, and degrees. Calculate rafter length and roof height for any pitch. Essential tool for roofers and carpenters.
Pitch Conversion
Conversion Results
Slope Angle0°
Rafter Length0ft
Roof Pitch4/12
Roof Rise (Height)0 ft
Pitch Factor1.05
Percent Slope33.3%
Common Pitches
3/12: 14.0° - Minimum for shingles
4/12: 18.4° - Most common
6/12: 26.6° - Good drainage
8/12: 33.7° - Snow regions
12/12: 45.0° - Maximum walkable
Formula
Angle = arctan(rise ÷ 12)
Rafter = run × √(12² + rise²) ÷ 12
Rise = run × (pitch ÷ 12)
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