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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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Feature request: Formulas in certain fieldsAsked by sagrafismo on April 23, 2013 at 05:47 AM
Congratulations for your excellent program. I would like to make a suggestion that I think is very useful. It would be great to allow the use of formulas, even simple as: Field3 = field1 *field4. I hope to soon see this innovation implemented. Thank you for your attention.
Thanks for your kind words!
And also thanks for your suggestion. I will add this to our feature request list.