Calculate the length of a common rafter, and the length of a hip rafter based on the common rafter length.

Calculation

1. building width in feet and inches (outside sheating to outside sheating)
2. overhang in inches (from outside sheating to sub-fascia)
3. ridge board thickness in inches
4. slope ratio, amount of rise per foot of run in inches

Results

1. common rafter length
2. common rafter length in inches
3. hip rafter length
4. hip rafter length in inches