Roof Rafter Length Calculator by Pitch
Rafter length by pitch uses the roof run and slope factor. The calculator includes ridge deduction, overhang tail length, pitch angle and rafter count.
roof rafter length calculator by pitch rafter length calculator by pitch common rafter length calculator
Slope factor
slope_factor = sqrt(12^2 + pitch^2) / 12
Common rafter length
L = run * slope_factor
Layout caution
This is roof geometry and material count, not a structural rafter span table for species, grade, snow load, wind or code design.
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