When "calc price" mode is used, then product will be added to the cart with the current calculated price. This way you can set not just "free" price, but any price. For instance, you may want to offer samples at very cheap price, but not for free. Makes sense, right? 😉 How to set such price? By using any other Options you like, utilising fields conditional logic and your creativity! We provide tools, you create the result 😇