Excal is the iPhone calculator re-imagined. Adding two important functionalities. Firstly, a percentage operator simplifies day-to-day use and makes it behave like most business oriented calculator. Secondly, a built-in currency converter supporting 49 major currencies lets you know instantly how much a foreign purchase cost in your home currency. Finally, ExCal does not aim to break new ground in user interface. Users can expect the consistency of the same interface and behaviour as the iPhone original calculator.