Are you referring to Adobe FormsCentral or Adobe Acrobat (PDF forms)? FormsCentral doesn't support calculations.
I am using Pro for my forms. I found I can use 'average' in my calculation and it works. Thank you for responding, really appreciate your help.
I just signed up for FormsCentral. Is this for real that formscentral does not offer form fields that calculate??
Sorry, we don't support them yet.
After a lot of requests regarding the lack of "calculated field" on FormsCentral, is Adobe thinking to add this functionality?
Or it is already discarded?
I suggest you to take a look into this player: http://www.formstack.com/
I am not saying that they are better than Adobe, once I love Adobe products...
It´s just a benchmark that you should take a look, and think on improve your tool.
Calculation field example: http://www.formstack.com/examples/online-order-form