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 recommend reviewing also our user guide on: How-to-perform-calculation-in-the-form
The Calculation formula editor is just like any normal calculation creator.
The formula should be enclosed on parenthesis if there are nested calculation being done.
((1+2) * (3/4))
As you can see on the example this is a nested calculation. So the formula needs to be contained on parenthesis as needed.
Hope this help. Let us know how we can be of further assistance.