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  • Profile Image

    Help with a formula calculation

    Asked by RogerYelvington01 on January 08, 2014 at 03:30 PM

    Hey guys!

    Currently I have this formula in the "remaining balance" field:


    There are currently two problems:

    1.  If nothing is entered into the "tanning dues rate" field, then it shows an inaccurately high balance

    2.  If 0 or 0.00 is entered into the "tanning dues rate" field, no calculation will result or show in the remaining balance field

    If a client does select to add tanning, and you type in the amount, 15.00 - then the calculation is accurate.


    Please advise, thank you!

    Page URL:

  • Profile Image

    Answered by Cesar on January 08, 2014 at 05:17 PM

    It appears this is due to the fact you are multiplying a zero thus making the total a zero. If in case you would need to calculate {remainingPayments}*{tanningDues104} with no {tanningDues104} payment, then adding a 1 to the {tanningDues104} field should not modify the price. 

    I would suggest to leave that fields minimum/default amount value to 1 instead of zero. 


    Example Form:


    Do let us know if you need further assistance, thank you.

  • Profile Image

    Answered by RogerYelvington01 on January 09, 2014 at 01:27 AM

    Thank you for the suggestion!  That helps a little - however with the following current formula, the Remaining Balance amount will still be inaccurate for clients that opt out, and do not want to pay for tanning:



    Remaining Payments: 23
    Member Dues: $39.99
    Tanning Dues: $1 (Default Value, even when does not want tanning)
    Remaining Balance: $919.77

    However our calculation currently results as $942.77, which is adding the tanning amount 1x23, making the balance $23 too high (and the client unhappy, as they do not want any charge for the service unless the opt-in).  The calculation works when the client opts in for tanning, but increases the balance by the number of payments even when they opt out of tanning.

    Please advise, thank you!


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    JotForm Support

    Answered by jonathan on January 09, 2014 at 06:06 AM

    Hi Roger,

    Unfortuantely, you cannot use condition logic within the calculation fields.

    Like in your case, the condition

    IF {tanningDues104} = 0

    THEN [({Remaining}*{memberDues})+{Remaining}]

    IF {tanningDues104} > 0

    THEN [({Remaining}*{memberDues})+{Remaining}+{tanningDues104}]


    Can you please tell us if my sample condition above is applicable to your desired computation?

    I think we can do this on the form by using 2 tanningDues field.. and use it in computation.

    It can be a lot of work if we can only use the form builder for all the custom computation.

    BUT it can be a lot easeir if you can use the form's source code embed because you can easily create a custom javascript computation code to work in your form. This will require embedding of the form's source code into a website.

    Inform us of your feedback on this.