PayPal shopping cart lets you set shipping profiles, taxes, and other upfront costs for domestic and international shipping and any country in the world.

Besides setting up the price range as per weight, you can set a base pricing value for shipping. Based on the quantity of an item purchased. Paypal shopping cart does come with a shipping calculator to set all such options under Merchant Services.

The view cart/add to cart option applies globally to the entire shopping cart. It automatically applies as per the zip code of a location into the shopping cart at the checkout. Moreover, it automatically applies based on the zip code or the location entered into the checkout shopping cart.