You don't always have a calculator with you but you always have your phone.
Perpenso Calc is a calculator application for the Apple iPhone, iPad and iPod touch. It is five calculators in one fully paid app
: scientific, statistics, business, hex and bill/tip. All five modes are included.
With its support for RPN, fractions, complex numbers and many other features it is comparable to traditional handheld calculators. Worksheets offer a more natural way to enter, edit and view data and to perform some common calculations. iPad specific functionality includes customizable display lines.
Perpenso Calc 4 is a related upgradable lite app
. Scientific mode is included and the other modes are optional. Perpenso Calc is offered at a discounted price and may cost less than adding all your desired functionality to Perpenso Calc 4.