The 13.1 version of DesignCalcs is provided as a free download on our website. DesignCalcs is included in Photo & Graphics Tools. This software is an intellectual property of CEI.
From the developer:
DesignCalcs boasts an extensive data library complete with industry data and methodologies to make Code compliance easier than ever. DesignCalcs includes scores of industry data from a wide variety of trusted resources, such as codes, standards, and manufacturer catalogs.
You may want to check out more software, such as Dcalc, which might be similar to DesignCalcs.