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.
It depends on how you are calculating things. Perhaps these guides might help:
1. If you are calculating things on a matrix field, you can check this guide: http://www.jotform.com/help/343-How-to-perform-form-calculation-using-the-Matrix-Field-
2. If you have check boxes, radio buttons and drop down fields, then you can assign calculation value on them. You can follow the steps here: http://www.jotform.com/help/301-How-to-Assign-Calculation-Value
3. Now if you wish to get the total of these fields and sum them up on a final calculation, you can use the form calculation widget on this. Here's a guide that gives you more details: http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form
Aside from using the form calculation widget, the Conditional logic also does allow you to make calculation based on the rules you have. To learn more about conditions, you can check this link: http://www.jotform.com/help/57-Smart-Forms-Using-Conditional-Logic
I hope that helps.