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.

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    How do I add a formula to calculate total cost based on # of total family members registered?

    Asked by Yaa Nsia Phillips  on January 29, 2016 at 10:10 PM
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    Answered by Boris on January 30, 2016 at 12:20 PM

    In order to calculate a cost based on selection in a form field ("How Many Family Member  for Membership"), you will first have to assign calculation values to items in that form field:


    Then, you will have to use a Form Calculation field to calculate the total price from the field above:


    Finally, you can pass the calculated value to the payment tool for processing by following this guide:


    Let us know if you need further assistance in setting it up, and we will be happy to help.

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    Answered by yopare on January 30, 2016 at 04:11 PM

    Can you assist with show/hide conditional logic fields?
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    Answered by Boris on January 31, 2016 at 03:23 AM

    Yes, we can help you with conditional logic. As it is another question, it has been moved to a thread of its own:


    We will assist you with conditional logic there, shortly. Thank you.