Hello @mr-peri
If the form and product are integrated using the “CFF – WooCommerce” add-on, distributed with the Developer and Platinum versions of the plugin, you can use as part of the equation the global variable: woocommerce_cpcff_product_price
generated by the add-on, with the price of the current product.
For example, assuming you have created form that you want to use with multiple products, and you are considering the price in the product as the price per square meter, and your form includes two fields for width and length: fieldname and fieldname2
The equation associated to the calculated field to get the definitive price would be:
fieldname1*fieldname2*woocommerce_cpcff_product_price
And now you can integrate the form with all your products and the price to use in every case would be the correct one.
Best regards.