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.

  • Profile Image

    Form Calculation widget: the values seem to be 'jumping' and changing their total

    Asked by cheesewake136 on April 10, 2015 at 03:26 PM

    Hi, I am trying to assign calculation values to my products. When testing I find that the final calculation number at the bottom is displaying random numbers on its own that don't seem to be correct. 


    Any ideas?



    Page URL:

  • Profile Image

    Answered by Ben on April 10, 2015 at 05:42 PM

    I took a look at your website and I see that you have quite a few different features on it next to the form and that the form is using js embed code, so I will suggest to use iframe embed code instead.

    Even so, I always like to check direct link to make sure that there are no issues and when I did, I saw that the same error is still found and even slowing things down a bit.

    Now this is what I saw in your Form Calculation:

    Immediately I noticed that there are no math symbols, which do not explain what was going on, but are more than likely to cause some kind of an issue.

    Now I added the plus between them to bring you a total sum, but when I added the last one I noticed that you have added your payment tool into Form Calculation as well and this is the actual cause of the issue.

    Let me explain:

    - You have the payment processing tool set to capture the value of Form Calculation
    - You then make the same form calculation capture the value of the payment processing tool as well

    - Basically they are going in circles, one grabbing a new value from the other and in doing so, make the other one update their value again.

    Now I removed it and left the rest as it was (with the plus in between) and this is how it looked at the end:

    and it works :)

    This is the form: http://form.jotformpro.com/form/50997029145967

    You can clone it to your account by following these steps: How to Clone an Existing Form from a URL or you can set it all up as above and it should work for you again :)

  • Profile Image

    Answered by cheesewake136 on April 10, 2015 at 07:59 PM


    Every time I contact you guys I am amazed. This is THE definition of customer support. 


    Thanks again,


  • Profile Image

    Answered by Ben on April 11, 2015 at 03:24 AM

    Hi Chris, thank you for the nice words, that is always nice to hear :)

    Based on that I believe that everything is running smoothly :)

    Do let us know if you have any further questions or issues and we would be happy to assist with them.