If the iPhone is king of the smartphone mountain, PCalc is what did all the complicated mathmagics to figure out just exactly how far and high it had to vector itself to get there. It's not like the built-in calculator on steroids (how cliche!) it's like the built-in calculator on Hulk serum! And the great folks over at TLA Systems are giving us four (4) copies of PCalc ($9.99 - iTunes link) to give to you!

PCalc is ideal for scientists, engineers, students, programmers, or indeed anybody looking for a feature-rich calculator for the iPhone or iPod Touch. It includes an extensive set of unit conversions, a paper tape, an RPN mode, engineering and scientific notation, as well as support for hexadecimal, octal and binary calculations.

How to get one? Just drop us a comment below and tell us the calculation you'd least like to see. What don't you want to know? How much you've spent on iPhone apps? What that car repair's going to cost? How much Apple will charge for the iTablet?

Give us your best comment, and we'll give four (4) of you free copies of PCalc!

  • US iTunes Store account required to redeem promo codes.
  • One entry per person.
  • Contest starts now and ends tonight, May 11, at 11:59pm.