CalcExp is skin changeable!
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the GUI (Graphical User Interface) is very beautiful, and it's skin changeable! there are 7 themes created by professional artists, and you may get more without extra charge. the font for displaying result number is big enough for easy to read.
Powerful number formatting
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1. Convert result to Hex,Oct,Dec,Bin freely. eg: (Dec)255 - (Hex)FF.
2. 5 kinds of locales to format numbers fitting your custom: US,UK,France,Germany,Italy.
3. Set fraction digits freely from 5 to 16.
4. Grouping, eg: 1234.56 - 1,234.56. In Unit Convertor and Currency Convertor, the results are formatted like the calculator do.
5. Scientific notation, eg: 1234.56 - 1.23456E3.

Very friendly, Very easy to use
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1. the frequently used functionalities is intergrated into toolbar buttons, such as: undo/redo, and Unit/Currency Convertor, etc.
2. Most of the actions are binded with shortcuts, such as, Ctrl+Z to undo, Ctrl+S to save history, Ctrl+Up to recall previous expression in history, etc.
3. CalcExp can stand always on top to help you work with other applications. CalcExp can hide into systray and save screen space.
4. CalcExp is very easy to use, whatever you input expressions by keyboard or clicking mouse.
User defined functions and constants
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With CalcExp, you can define your own functions and constants. If you input a certain kind of expression very often, you can define it as a function, and call it later when you want it.
Multi-Platform & Click And Run
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CalcExp runs on Windows 2K/XP/Vista;MacOsX;Linux ; Solaris . Based on Java Web Start technologe, the installation is absolutely easy. Visit our website, click "launch" button and run it within 1 minute.
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