Roof Pitch, Slope Angle & Common Rafter Length Estimator
Calculate roof pitch factor (X/12), pitch angle in degrees (°), roof slope percentage (%), ridge rise height, and true rafter length including eaves overhang.
Total Common Rafter Length (incl. Overhang)
Calculator Inputs
Total Common Rafter Length (incl. Overhang)
Roof Slope Angle (°)
Ridge Peak Rise Height (m)
Roof Slope Percentage (%)
Horizontal Roof Run
Roof Run vs. Rise vs. Rafter Length Breakdown
Structural rafter sizing (e.g., 2x6 vs 2x8) must comply with local snow loads and span tables.
All engineering calculations, structural estimates, and electrical sizing metrics are provided for preliminary estimation only. Always ensure compliance with relevant statutory building codes and occupational safety standards, verified by a certified professional engineer before practical implementation.
Calculation Methodology
Run = Building Width / 2. Rise = Run * (Pitch / 12). Rafter Length = Sqrt(Run² + Rise²) + Overhang Length.
Frequently Asked Questions
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