Tripence Software BlitzCalc Description:

BlitzCalc is a very useful and handy calculator for Windows. It supports mathematical, arithmetical, trigonometric, statistical, and other functions, including physical and mathematical constants. In contrast to all ordinary calculators, BlitzCalc lets you make your calculations (both simple and advanced) with a single keypress in any window. We developed it, keeping in mind our users' needs, and now it is available for everyone.