Program wanted: bet/odds/pool calculator

[LoganDimes]

Does anyone know of an application that will calculate a particular bet's effect on a horse's odds, given the before-bet pool total and the takeout rate?

[tanda]

It is not difficult to calculate by hand, so it can be programmed in Excel, etc.

A = Pool Size
B= Amount Bet on Horse
C= Takeout (expressed as 1-takeout, 15% takeout = 0.85)
D = Wager Amount

[{(A+D) * (C)}/(B+D)]-1 with result expressed as odds to one.

[LoganDimes]

Thanks, although I'm also looking for a place/show tool, and from what I've heard the calculations for those are not so simple. Suggestions?