# Calculator Help

As you would expect, you use the calculator just as you would a real pocket calculator. Just as with a conventional calculator, space is at a premium, so many of the calculator buttons have to double up the functions they provide. The layout of the calculator in its normal state has the functions you would expect to see on a fairly standard scientific calculator, which means that it is probably self explanatory. Notice the shift button in the top left hand corner.

The functions of the buttons in their shifted state are not marked on the calculator body, but the buttons change when you press the shift button. If you press the shift button again, the buttons revert to their un-shifted state.

To access additional functions, click on the opt button. This allows you to change the way the calculator works, or change its mode. Different functions are available depending on the calculator mode, and are indicated by changes to the legends on the calculator buttons, and include:

- Base-n, hex, octal and binary modes
- Scientific/Engineering Functions
- Matrix/Array Functions (Windows CE3 and higher only)
- Complex Numbers
- Statistical Functions
- Financial Functions
- Reverse Polish Notation
- Units Conversions
- Physical Properties and Constants
- Time Functions (including stopwatch)

If you get an error, the calculator display will contain an appropriate message, and possibly some further descriptive information. In the case of certain errors, the calculator functions are disabled and you need to press the AC button to clear the error.

For more information about using the software, installation and registration, see the full help files. These should be in the set of files which came with the software, or can be found online on our website at http://www.calculator.org/.