Paying for multiple things in different question fields

I need to collect payment on a few different categories and I can't seem to get it calculate with all of them.

Example:

Registration $15, $20, $0

T-shirt payment  $10, $15, $20

It will calculate the registration payment in the totals but won't also account for the t-shirt payment.

Please help.

First thing to note is your drop down fields. Make sure to put 0 on the first calculation value for the empty drop down option.

Then open the calculation wizard from your calculation field and do the same formula.

Here's a clone of your form http://form.jotformpro.com/form/52428235266961? with a working calculation. Feel free to clone this form back if you want.

Cheers!