Looking for a form that calculates quantity and price and displays the result.

Greetings. 

I'm looking for  from that will display multiple quantity options (lets say 10 at the most) along with multiple size options (say 20 at the most) and then calculate the price.  

When the customer selects the quantity and then selects the size it would display the result.

I would want it to flow into the payment option as well if possible

I would embed the from into my product page.   The url below is stand alone.

I checked your form and it appears that you have already setup the form you are looking for. All we need to setup now is the calculation of the Size and Quantity field. To perform calculations in the form, simply follow this guide: How to Perform Calculation in the Form? Input your formula in the Calculation Field and it should automatically calculate the result based on the user's selection.

Once you have the formula setup in the calculation field, you can then pass the result into the Payment Tool of your choice. To do so, please follow this guide: How to pass a calculation to a payment field

You can check out this cloned demo form where I have setup a simple formula to multiple the size and quantity, then pass the result onto the payment field. You can also clone it to your account to see how it is setup.

https://form.jotform.com/61717760330957