TOP CHORD / RAFTER LENGTH CALCULATOR
You can install this handy Excel worksheet for your computer and compute the rafter length; input the pitch, truss length and overhang to get your answer. The rafter length will give you the information you need to compute the square footage of your roof and determine plywood and shingle needs, and you can figure out your facia board and associated trim needs.
You will have to enable MACROS for the calculator to work properly.
