Founded in 1907 as a messenger company in the United States, UPS has grown into a multi-billion-dollar corporation by clearly focusing on enabling commerce around the globe. This extension requires that your server has SimpleXML installed. It primarily works with ins and lbs, but other units can be converted automatically. The Rates API will return rates in the currency of the country in which the API was registered so make sure this matches your store. UPS can calculate quotes worldwide, as it handles both domestic and international parcels:

DOMESTIC	INTERNATIONAL
Next Day Air Early Next Day Air Next Day Air Saver 2nd Day Air AM 2nd Day Air 3 Day Select Ground Standard	Worldwide Express Worldwide Express Plus Worldwide Expedited Saver