The sea shipping from china to usa cost is calculated in accordance with the provisions of the liner freight table, which is a monopoly price. Different liner companies or different shipping companies have different tariffs, but they are all determined according to different stowage factors, different properties and different values of various commodities combined with different routes. 
Calculation of sea shipping from china to usa cost:
Usually, according to the weight of the goods; according to the size or volume of the goods; according to the weight or size of the goods, choose the one with the higher freight to calculate the freight; charge a certain percentage according to the FOB price of the goods, which is called ad valorem freight; each piece is a unit Calculation and collection; the freight is collected by the two sides of the ship and the cargo through a provisional agreement, which is called bargaining.

The content of sea shipping from china to usa cost:
(1) Select the relevant tariff book;
(2) According to the name of the goods, find the freight calculation standard (BASIS) and class (CLASS) in the goods classification table;
(3) In the basic tariff part of the class tariff table, find the corresponding route, port of departure, port of destination, and check the basic freight rate according to the class.
(4) Find out all receivable (payable) surcharge items and amounts (or percentages) and currency types from the surcharge section;
(5) Calculate the actual freight rate based on the basic freight rate and surcharges;
(6) Freight = freight X freight tons