What is a soundex calculator? It is a calculator that uses an algorithm for encoding a word or name so that similar sounding words or names encode the same. There are numerous applications for this algorithm. For example, some state driver license agencies use this algorithm in the driver license number as the first four characters. You can get a detailed definition of Soundex from this government site: Soundex Indexing System
Just enter a surname (last name) and then click the calculate button and the soundEx code will appear in the second textbox.