ShipStation does calculate shipping cost with its rate calculator feature. 

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You can use the calculator to see the cost of the shipping service you’re currently using for a shipment and compare it to other available services. 

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But ShipStation does not use the calculated cost to auto-select the cheapest rate for every shipment. 

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But, you can integrate a platform called String into your ShipStation account to automatically calculate the full shipping cost of every order and auto-select the cheapest shipping rate. 

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You can learn more about how String works here. 

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You can also get a free savings analysis from String by requesting a demo at www.meetstring.com.

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