Basic Calculator Pro for Android
As well as the four basic mathematics operations the calculator can carry out square roots and powers. There are buttons to include your previous answer in the next calculation as well as the constant pi. Brackets can be used to enter more complex calculations.
The calculator follows the usual BODMAS rules for order of operations. There is no limit to the size of the calculation being entered and the top half of the screen can be scrolled horizontally to both review and edit the input. The cursor position can be set by touching the screen or using the buttons just below the screen.
Although limited to basic operations, keeping the display uncluttered and simple to use, this is a robust calculator giving accurate results up to at least 10 significant figures.
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by Y####:
This is a great alternative to the stock Android calculator. It has a simple set of functions but you'll find everything you need unless you want to solve trigonometry problems and the like. It's fast, accurate and easy to use, and it has a much nicer design than the stock app. I'll gladly make this my default choice.