 <p>Gartner estimates 160 lines of code converted per man day for roughly similar languages. That plus the size of your code base gives you a rough estimate, if you assume the ColdFusion is "like" C# (e.g., all the Coldfusion constructs translate easily, which probably isn't the case; then the conversion rate goes down).</p> <p>See also discussion at <a href="http://stackoverflow.com/questions/2830612/things-to-keep-in-mind-during-application-migration-coldfusion-to-spring/2830712#2830712">Things to keep in mind during Application Migration: ColdFusion to Spring</a></p> <p>Our web page on <a href="http://www.semanticdesigns.com/Products/Services/LegacyMigration.html" rel="nofollow noreferrer">migration</a> provides more details including discussion of pitfalls and alternatives. </p>