Paste, reuse, even auto complete, calculations, with SpeedCrunch Calculator

SpeedCrunch is a free and powerful desktop calculator. It lets you see clearly what you typed along with the result in a scrollable display. You can also paste your expression from the clipboard, and you can quickly copy the last calculation result to the clipboard. SpeedCrunch may even give the answer before you finish typing (calc-as-you-type)! This allows you to “fix” your expression if you think it is not what you wanted.

If you want to recall again an expression that you typed before, you can access an expression history. Your expressions (the last 100 expressions) are saved between sessions. This means that you can still invoke those calculations you have done yesterday or last week.

Features: history and results on a scrollable display; up to 50 decimal precisions; unlimited variable storage; intelligent automatic completion; fully usable from the keyboard; more than 50 built-in math functions; optional virtual keypad to be used with a mouse; on-the-fly and selection calculation; customizable appearance; syntax highlighting and parentheses matching…

* Check also this free Desktop Calculator Gadget