Free desktop scientific calculator from Yahoo!
By Murray Bourne, 23 Dec 2006
UPDATE: Yahoo Widgets are no more, unfortunately, so these tools are no longer available.
I rarely use a (physical) calculator these days. Most of the time I use Scientific Notebook when doing any mathematics problem solving because I usually want to graph my result and/or save what I have done for publication on Interactive Mathematics.
If you have need for a calculator, and a computer-based one will suffice, then you could try the Yahoo widget called CalcMatic.
You first have to download the Yahoo Widget Engine which gives you access to many (mostly cool) widgets that sit on your desktop, something like:
Then go to the CalcMatic page and download it (it's very small). It looks like this:
See the 3 Comments below.