Well I have a simpler version of that on
http://bitcoin.clarkmoody.com/order-book/ but the good thing about my calculator is that is computes the slippage you will incur based on the current order book. I am also working on a version that incorporates more options - coming soon.
You have me pretty close to stop posting!
What you did there, is what provoked me to finally find something.
but also need a way to change bid and ask prices and insert the trade size percentage fees, which are sometimes different. I really suck at math, basically I was trying to do all of this with a regular calculator, for like a hour, then got fed up and went looking for a javascript calculator, that didn't work much so far, then I went looking for that stocks calculator which really does what I need but it costs 14.95, it rounds and it's only windoes which break it's usefulness. So then I went looking around to figure out how I decompile it with ollydbg and fix it! That didn't work.
Pheeeeuoow!
Still get to post!