2012 version of the Span Calculator for Wood Joists and Rafters

Uses wood properties from the 2012 NDS.  Results from this calculator do not reflect the latest information, contained in the 2018 NDS.

Important note about 2012 Span Calculator

The 2012 version of the AWC Span Calculator uses wood properties from the 2012 NDS. Results from this calculator do not reflect the latest information contained in the 2018 NDS.

2021 version of the Span Calculator for Wood Joists and Rafters

Uses wood properties from the 2018 NDS (the most recent version). Please email info@awc.org if you encounter issues.