Free Calculator
Rafter Calculator
Calculate rafter length, span, and sizing for roof framing projects
Roof Dimensions
Building Width (ft)
Roof Pitch (in 12)
Pitch Unit
inches per foot (4/12)
degrees
Calculate Rafter
Your Rafter Measurements
Rafter Length
-
Run
-
Rise
-
Roof Cross-Section
Run
12 ft
Rise
4 ft
Span
24 ft