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.
It is indeed possible to fill fields based on the entries in other fields using the "Update a form field value" condition:
Here is a quick test form to show you how it works:
If you have any further questions or need any help setting this up in your own form, let us know and we will be happy to assist you.