The 'Shipping markups' section allows you to define markups for real-time calculated shipping methods. This can be useful when your shipping expenses exceed the value returned by the real-time shipping processor (e.g. you have to pay for packing, insurance, etc). The 'Shipping markups' section can be accessed by selecting Shipping markups in the Inventory menu.
Picture 1: Shipping markups.

The markups defined here will be added to the value returned by the real-time shipping calculation service.
If you define any markups, the shipping rates in your store will be calculated according to the formula:
SHIPPING = Rate + Markup + TOTAL_WEIGHT*Weight_Markup +
+ ITEMS*Item_Markup + SUM*Percent_Markup/100
Where:
• Rate is the shipping cost returned by the real-time calculation service (like UPS, FedEx, etc)
• Markup is a fixed markup amount applied to the order (the value of the "Flat" field).
• Weight_Markup is a shipping markup based on product weight (the value of the "Per lb" field).
• Item_Markup is a shipping markup applied per item of the products ordered (the value of the "Per Item" field).
• Percent_Markup is a shipping markup calculated as percent of the Total Amount Ordered (the value of the "%" field)
• TOTAL_WEIGHT is the sum of weights of all the items in the shopping cart (variable). Product weight can be defined when you add a new product.
• ITEMS is the total number of items in the shopping cart (variable).
• SUM is the total order amount (variable).
If a markup should be applied only to a certain weight and/or order subtotal range, specify this range using the corresponding fields.
Defining markups is similar to defining shipping charges.
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