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.
Unfortunately it is not possible to use calculation inside the Matrix Dynamic, but it is possible to make calculation in the matrix field, by adding a condition to update a form field:
You can select the matrix and the option is filled > add field:
You can select the option show headers in order to be easier to select the right fields:
Now you need to select the output (the total cell):
You need to repeat this process for each line where you want to have calculation.
The downside is that the user cannot add more rows.
In order to use the calculation inside the matrix you need to access the old wizard by accessing this url:
You can test the demo form:
Let us know if we can assist you further.