This is the calculator you need
PCalc continues to be the best calculator app on iOS. If youve exceeded the abilities of the built-in basic calculator, you need this. It has a wide range of conversions and functions, a lot of great customization for the calculation display and themes, a well-implemented persistent tape, and a whole bunch more stuff.
The new features to let you customize the calculator are awesome, but the best is iOS 8 support for putting a little calculator into the notifications screen - so handy, you can even do quick math while your phone is locked, so handy!
The author is responsive to feedback, and supports the product very well.
csaldanha about
PCalc, v3.3