Rafter Length Chart
A rafter length chart is a roof pitch slope-factor lookup. The calculator applies the same geometry to span, ridge thickness, overhang and rafter spacing.
rafter length chart rafter length calculator by pitch roof rafter length calculator by pitch
Slope factor
slope factor = sqrt(12^2 + pitch^2) / 12
Common rafter length
rafter length = run * slope factor
Layout scope
This is layout geometry, not a structural span table. Species, grade, snow load, wind uplift, bracing and code span checks are separate.
Related pages
- Rafter calculator - live common rafter length and count calculator.
- Board feet chart - lumber volume follow-up for stock takeoff.
- Wood beam span calculator - preliminary span screening.
- Roof ventilation calculator - net free area planning after roof layout.