Anyone know where there is a free online compounding interest calculator?

[Anonymous]

Anyone know where there is a free online compounding interest calculator?

I just want to see how a debt increases - trying to compare getting a $50 reward now that I will apply to a debt, and seeing how that would reduce the interest. (Compared to waiting until I have $200 in  rewards, where I get an extra $50.)

Thanks!

[llecs]

I don't know if this is what you are looking for:

http://www.bankrate.com/brm/calc/creditcardpay.asp

-or-

http://www.bankrate.com/brm/cgi-bin/apr.asp