How are shipping rates calculated?

The default installation of Addition calculates shipping rates based on the dead weight of a cart and assumes BYO packaging.

For more accurate shipping rates you can record the dimensions of your most used packaging, and product dimensions.

When Addition is completely configured to how you actually send your products, the app will be able to make an informed judgement on what package(s) to quote your customers shipping rates, based on the cart contents; the quantity, weight and size of each item.