There’s a calculator on my cell phone. There’s probably one on your cell phone.

So I made one for my mp3 player (iRiver SPINN).

swfobject.embedSWF(“”, “CalculatorVersion0-1”, “480”, “272”, “8”);

It seems to work, but there may still be bugs. To download it, right click on the link above and pick save content as, or something similar.