I thought I would share a neat online calculator I wrote to help people working out numbers / doing quick math. It's a cross between notepad and a spread sheet. It's ideal for working out quick and dirty math, because as you type it computes the result. You can reference rows (R1) just like in a spread sheet, or you can store values in variables, e.g. X=123.
I wrote it for myself, for when I'm programming and I need to derive some expression. But I packed in the ability to save and share calculators to try to make it more useful for the entire community.
You can check out my program here: http://www.ZoomCalc.com
Here is a simple example for computing Win/Loss ratio:
http://zoomcalc.com/?p=82

Here I calculate the number of attacks required by a Zergling to kill a Zealot in the game Starcraft 2. This should show you how you could compute more complex things.

Heres the link:
http://zoomcalc.com/?p=88
This calculator is read only, simply click Create Copy to edit it.
Currently the calculator supports:
sin(X), cos(X), tan(X), asin(X), acos(X)
atan(X), atean2(X), sqrt(X), log(X)
abs(X), ceil(X), floor(X), round(X)
exp(X), random(X), fac(X)
min(X,Y), max(X,Y), pow(X,Y)
+, -, *, /, %, ^, ||
Your some of the first people I have shared this with, so please rip it apart and provide constructive feedback