JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I'm not sure if I understand your query correctly. Do you mean to have a sum of the values of matrix fields from different forms? If so, unfortunately it is not possible to perform calculations from different form submissions. However, you may find our combine submissions app useful in combining submissions from different forms with similar fields to generate a report.
If you are referring to something different, please let us know. We will be happy to help.