How do I create a calculation box?

Hi,

Here is our guide on how to associated calculation values with selections in your form:

http://www.jotform.com/help/301-How-to-Assign-Calculation-Value

Once you have your calculation values, you can add a calculation widget to perform the actual calculations:

http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form

If you have any further questions or need help setting up a specific equation, let us know and we will be happy to help.