First decision you need to take is whether you will do the calculation on the server side or on the client side. If it's just a formula that takes only the entered values, there's no need to do the calculation on the server. Just just a little javascript to crank out and display the answer. (You won't be helping mankind by hiding the formula). If you do it on the server side, Perl is one or many languages that can be used. Only use Perl if you feel comfortable with Perl - know that you will be a minority as most programmers don't feel comfortable with Perl. Whether Perl is right for you is something we cannot answer. We don't know you.