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.
The first thing you would need to do is assign calculation values to your fields options:
After that, add a "Calculation" widget to your form:
You can then setup your calculation in the widget to be performed on your calculation values.
If you have any further questions or need help getting this setup in your own form, let us know and we will be happy to help.