Handy and useful expression calculator and unit converter with skins. Main features: fully customizable interface with skins; keyboard shortcuts; all arithmetic operations, more than 20 functions; editable lists of constants and unit conversions; recalling previously used expressions; five result formats with changeable precision; automatic clipboard copy/paste; minimizes to the system tray.

1st Calculator is the Shareware version. The full version can be purchased by clicking on the "CLICK HERE TO ORDER" button below for around  15USD.