1st Calculator

From RomanLab Software:

This is a handy, useful expression calculator and unit converter. It includes a customized interface with skins, fast access to the program from the keyboard, all arithmetic operations, more then 20 functions, and editable lists of constants and unit conversions. It also recalls previously used expressions. The five results formats have changeable precision and can be automatically pasted and copied to the Clipboard. This program can run as a convenient icon in the system tray.

Version 1.14 fixed some pop-up error messages and added a new pop-up menu of the Expression field. This update adds a Quick Calculation mode, the option to show or hide animation, improved window docking, and other improvements and bug fixes.