WordPress administrative users can create a tiered flat rate shipping fee based on the total number of items in a WooCommerce cart. The store administrator can choose to apply this shipping method to all allowed countries that the store may ship to or only specific countries.
There are two tiers in this shipping method:
Base shipping fee: This is the base (default) flat shipping fee that is applied automatically to the cart total for any number of items.
Additional shipping fee for tiers: This is the additional shipping fee that is added to the base fee if the number of items in the user’s cart exceeds a specified number. This tiered fee can either be a flat fee, meaning that it is applied to carts of any size above the specified tier quantity, or a progressive fee, meaning that the tier quantity is used as a multiplier to the tiered fee.
Screenshot of “Tiered Shipping” setup as an enabled shipping method in WooCommerce Settings. This can be found by going to WooCommerce > Settings > Shipping in the WP admin.