Calculate between number field and real product price

Dear Gravity Help,

Is it possible to refer to the real product price in the form (fields)?
I'm creating a webshop for floors. In which 1 floor (for example) is €15 p/m2.

In a Gravity form I would like to add:
- {Number}... And I would like to calculate that: Input of {number} * real product price (€15,-).

Thanks in advance,

Danny Marquering

Yes sure. Here's the link: http://www.mijnvloertje.nl/mijnvloertje/?product=half-bond-oak
I'm still starting/testing/messing with the form, so it's just you can see what I'm trying to say:

The price here is €22,- for 1 /m2 floor. I use WooCommerce.
In the form I would like to add a 'quantity' field, in which they can write their number of needed /m2. For example 4. Than I would like to have a calculation or formula to do: {quantity input} x €22,- (product price).

Thanks in advance.

Is there any solution for this. I need it too!