Woocommerce: dynamically change the price of a Pricing Option field

Hi,
I am building a form using Gravity Forms and Woocommerce, for customers to place a custom product order. They should be able to select the number (in this case, number of days' worth of juice), and then choose certain addons. The price should update dynamically at the bottom, so the number of days part (and thus total price) is easily shown with an Option Pricing field, Drop Down type. Label "1 day", Price "$10.00"; Label "2 days", Price "$20.00", and so on.

Here's the kicker: the other addons should dynamically change how much more expensive they become based on the number of days. For instance, say I have a Low Sugar option (still an Option Pricing field, Checkbox type). $2 extra. That's easy enough, but if I selected "2 days" earlier, that should change and it should now say $4 extra. Or I selected "30 days" and now it should say $60 extra.

Is there a way to simply make the Price of a choice display the result of a formula? In this example, it'd be (2 * number of days). I'm stumped on how to make this happen.

Hi David, thanks very much for the helpful reply. You caused me to reexamine my process, and it seems that my problem was with the Quantity field. It was not achieving the goal (of updating the price when a new quantity was entered). My Product field on the form was set at $0.00, while the correct product price was set in WooCommerce. I reversed this and set the WooCommerce product price to $0, and put the price into the Product field. Voila - now it shows as $0 when the quantity field is empty, and updates dynamically as the quantity is increased, and my options work as desired too. Thank you!

Hey David,

I'm hoping you can help me with one more thing. So we got this all sorted and now when I change the quantity, any additional options increase the price by their amount multiplied by the product quantity. Perfect.

BUT - what if I want an option to add on something that increases the price by a fixed amount no matter what the quantity? Is that possible?

Thanks!

Hmm, I'm slightly confused as to how that would work. When I add another product field it seems to change the price of the whole product the form is associated with. Are you suggesting there is a way to use this field to tack on a single extra product to the purchase?