Why don't you try:
http://coinia.net/groestlcoin/calc.php
Regards,
good spot
and for my profit calcs its more of something for me to just look at, and see what i am actually getting. for example the calcs say around 550 a day, i am actually getting over 700. yesterday on groestl i got 37 in one block because it was a very short round and i got shares in, so its not the best to follow unless you plug in real figures, as luck comes into it sometimes
the way i am doing it is actually linking it to the wallets, so give me a coin for calcs, and a hashrate and i will give results, i may make it live and just enable coins people want