Advanced Calc

I don't know of the functions of these, but check them out on your own:

http://my-symbian.com/7650/applications/applications.php?fldAuto=657&faq=2
http://my-symbian.com/7650/applications/applications.php?fldAuto=439&faq=2

Big thanks for link but unfortunately this calcs haven't this functions 😞

Then, perhaps, http://www.midlet.org/ has a Java based utility program that'll do what you want and hopefully it'll even work on your phone.