Shipping of a product is quite a tedious task but most e-commerce websites take care of it by providing the service by themselves. But since every product is is different and varies in size and weight, eCommerce platforms have made their own slab depending upon volumetric, destination, weight, and several other factors.
Shipping fee is computed based on the outbound shipping weight which is Aggregated Billing weight of all units in the shipment + Packaging weight. In shipment case it could be calculated by the (Local, Zonal & National).
Volumetric Weight is calculated using the formula, (Length x Width x Height) divided by 5000 to get the Volumetric Weight of a unit in kilograms. Length, Width and Height are all in centimetres.
The fee rates for selling on marketplaces vary based on the fulfillment channel you are using to deliver orders, shipping fee is the cost used to ship items to a buyer.