There is a basic calculator widget in the dashboard, and an application for a calculator in the Apple Macbook when purchased, but for many scientific and tech students using a mac, this one would be a great find -

Magic Number Machine – A high-precision scientific calculator for mac tech freaks.
It is available for Mac OS X 10.4 and greater versions.

Here are some features making it more beautiful -

• 25 Digits - Unlike the 10 digits of a normal calculator, making it easy for biggest numbers calculations.
• Complex numbers - Complex numbering for your calculations with under-root and power functions.
• Hexdecimal, octal, binary, decimal and 2’s complement display.
• A graphical display that you can click on to change the entry point
• Value memory limited only by computer memory.
• Matrix functions including gaussian elimination, inversion and determinants.
• Large number of scientific constants built-in, perfect technological value.
• Linear regression - An analysis between 2 parameters.
• A full expression history (go back to anything which you were calculating previously)

This calculator is available in 4 languages -

1. English
2. Spanish
3. French
4. German

Download the magic number machine application here.