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 am sorry, unfortunately you cannot perform calculations with dynamic fields, such as Configurable List or Infinite List widgets.
Depending on your requirements, you may be interested in using our Spreadsheet widget, which allows using calculation functions on its cells. However, this widget is not a dynamically expanding widget.
If you are interested about Form Calculations in general, I would advise you to take a quick look at our guide on How-to-perform-calculation-in-the-form
Please let us know if you need further help.