The Rafter Boards for One-sided Roof calculator computes the number of rafter boards for a single side of a gabled or flat roof based on the width of the roof and the on-center spacing of the rafters.

INSTRUCTIONS: Choose units and enter the following:

• (w) Width of Roof 
• (oC) Spacing of onCenter Rafters

Rafter Boards (nR) : The calculator returns the number of rafter boards for the one-sided roof.