Below you will find some useful links to various topics.
Needlepaints to DMCfile:///C:/Users/User/OneDrive/Threaded%20Needle/Threaded%20Needle/Useful%20Links/Needlepaints%20to%20DMC%20conversion.htm
Weeks Dye Works Threads to Nearest DMC Equivalent
Classic Colorworks (Crescent Colours) to DMC
Which Needle? (from John James Site)