Roof Pitch → Angle & Area Multiplier
Vertical Rise (Inches)
Horizontal Run (Inches)
Pitch Presets
3:12
4:12
6:12
8:12
12:12
Angle (Degrees)
26.57°
Area Multiplier
1.118
Pitch Fraction:
6:12
Rafter Length (per foot of run):
13.42 inches
Angle = atan(rise ÷ 12); multiplier converts footprint area to true roof surface area.
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