US Dollar Index RT Charts
USDX does it through exchange rates averaging of US Dollar and six most tradable global currencies.
USDX = 50.14348112 × EURUSD−0.576 × USDJPY0.136 × GBPUSD−0.119 × USDCAD0.091 × USDSEK0.042 × USDCHF0.036
Those 20 countries (15 eurozone countries and five other countries, whose currencies are represented in USDX) make up the basis of global trade with the USA,
have highly developed currency markets with the quotes which are independently determined by market participants. Besides, many currencies not included
into USDX, are traded in close correlation with the currencies included in USDX. USDX value is calculated 24-hours a day, seven days a week.
Currencies and weights used in USDX calculation match the currencies and weights used in calculation of trade weighted US Dollar index by US Fed.