The programme consists of a single window, with tabs to select between the Erlang C Calculator, the Call Minutes Calculator, Erlang B Calculator and the Extended Erlang B Calculator.

The latest version boasts many new features including support for C.C.S. and Extended Erlang B. It has a progress bar to show you the progress of a calculation. The package also has the ability to display and print the results of any calculations you have made during the previous week.