Instructions for Getting Weight-in-Cart
Enable the "Show Weight in Shopping Cart" option in your store shopping settings. This option is off by default and you will need to be logged in with your BrickLink account to both set the option and view the weight in your shopping cart.
Add your desired products to the shopping cart and hit the "View Cart" button. Enter the weight shown the in the shipping estimator. It will then calculate the shipping costs based on the packed weight with handling fees (if applicable) included.
Calculated costs are an estimate only and may vary slightly from actual shipping charges. Please note that the BrickLink catalog weights are not always accurate.