Inconsistency exists between common conversions for soil index properties to the design k-value and a widespread nomograph that became the definitive reference on the topic in the industry. Propagation of these inconsistencies into guidance from groups like ACI 330 and 360 has contributed to confounding the industry, as has a gap between these results and common practice by geotechnical engineers. The American Concrete Pavement Association (ACPA) developed a conversion set to better align the industry on the matter, then including it in StreetPave, pavementdesigner.org, and the ACPA App Library. The development and adoption of the AASSHTOWare Pavement ME and release of a paper by SSI further complicated the discussion as the industry worked to understand the nuances between static and dynamic k-values. This paper presents a summary of the industry's prior practices and recommendations, a detailing of the approach proposed by ACPA, and guidance on which k-value is recommended for design of concrete pavements and slabs-on-ground.