# How to calculate total based on user selections?

**newmethodanceministries**I have multiple participant fields. Once the customer selects Yes to they would like to a T-shirt and the size (Plus sizes will be more), if each participant and T-shirt selection can be calculated into one total at the end

For Example

If a customer is registering 10 participants and each participant would like a T-shirt, 4 out of the 10 participants are plus size shirts. (Workshop fee=$20 T-shirt Fee=$20/Plus Size $25.00)

So that would be a total of $200 registration

T-shirt Total $220.

$420 would need to be calculated at the end.

Or for whatever they selected. How can I accomplish this?

**Carina**1. You can add a dropdown field with "How many participants do you want to register?"

2. You can add calculation values to the fields, both the "How many participants" and for each t-shirt size:

3. Now you can add a calculation widget and add all the fields to the calculation:

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

You can test and clone the demo form:

https://form.jotform.com/52846585922972?

Let us know if we can assist you further.

**newmethodanceministries**not only that, the previous participant fields need to be calculated as well. Each participant field needs to be calculated

- JotForm Support
**Mike**This should be possible with custom calculations. I would like to suggest checking the next guides:

1) How to perform calculation in the form

2) How to assign calculation value

3) How to pass a calculation to a payment field

Take a look at '

*Calculated amount based on user selections and inputs*' section of the next article to see it in action.Mastering Payment Form Integrations with JotForm

Thank you.

**newmethodanceministries**I appreciate all of your help. I went through all of the tutorials. I am still having issues with the calculations. I have tried EVERYTHING lol.

When they choose a class and or if they choose a t-shirt size, it should be calculated. the calculations do not add up correctly. What am I doing wrong?

https://form.jotform.com/50818701594964

- JotForm Support
**Mike**Your calculations look good in general, but it seems that there are missing plus symbols between tshirtSize and participantClass fields. Please add them and re-check the form.

Thank you.

**newmethodanceministries**Ok I added the plus signs, but now it's not giving a total at all.

- JotForm Support
**Mike**I have removed the last plus sign, and calculations seems to be fine now.

Please test the form now.

**newmethodanceministries**OMG IT WAS THAT SIMPLE??????????????!!!!!!!!!!!!!!!

- JotForm Support
**Mike**Yes, that was it. The web things are quite confusing sometimes :)