The US Dollar Index (USDX) is an index (or measure) of the value of the United States dollar relative to a basket of foreign currencies. It is a weighted geometric mean of the dollar’s value compared only with – Euro (EUR), 57.6% weight, Japanese yen (JPY) 13.6% weight, Pound sterling (GBP), 11.9% weight, Canadian dollar (CAD), 9.1% weight, Swedish krona (SEK), 4.2% weight and Swiss franc (CHF) 3.6% weight USDX goes up when the US dollar gains “strength” (value) when compared to other currencies.
