The biggest blow by value will be to the U.S. soybean trade, the country's largest agricultural export to China, which will be hit by a 10% tariff and was worth just shy of $13 billion last year, the data showed. Reuters estimated the overall impact by comparing the 740 items listed by China on Tuesday against the U.S. census' trade database.

China on Tuesday swiftly retaliated against fresh U.S. tariffs, announcing 10%-15% hikes to import levies covering a range of American agricultural and food products, moving the world's top two economies a step closer toward an all-out trade war.