What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I have checked your form http://www.jotform.us/form/41455293467158 and I noticed this calculation
It was not about calculation of the value of drop-down field.
Are you perhaps trying to assign a hidden value to the email address field?
If you want to have a condition email base on a selection you should do it similar to what was described on this user guide instead.
It will have condition email like this
Please clarify what you wanted to do, and we will help you achieve it on the form