In order to preserve a stat calculator for future use, the full source is available here:

You are free to make changes, re-host, or otherwise "do what you want" with this source, as long as you also provide a way for the visitors to your site to download a copy of the source for what you host. Attribution and credit are not necessary. If you make changes or improvements, please contact Caesar on 3k and provide a copy of the changes.

Thanks,
-Caesar

Original source has been modified on 02/10/2021 to allow for stats up to 275 and levels up to 144. Zips and source will reflect these changes.

-Elminster