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The US Dollar Index, also known as DXY, is used by traders seeking a measure of the value of USD against a basket of currencies used by US trade partners. The index will rise if the Dollar strengthens against these currencies and will fall if the Dollar weakens against these currencies.

The U.S. Dollar Index (USDX, DXY, DX, or, informally, the "Dixie") is an index (or measure) of the value of the United States dollar relative to a basket of foreign currencies, often referred to as a basket of U.S. trade partners' currencies.

It tracks the performance of each of the chosen currencies against a basket of its most liquid peers by aggregating the moves of its exchange rates into easy-to-understand Forex indexes. Thus each index represents a string of average changes of the rates compared to the closing prices for a fixed base date.

After reaching parity with the euro in 2022, the U.S. dollar weakened modestly in 2023, but has stabilized in recent months. The dollar has also lost ground against other currencies. Changes in the dollar's value can affect results for U.S. investors who put money to work in foreign markets.

3 Common Ways to Forecast Currency Exchange Rates Purchasing Power Parity. Relative Economic Strength. Econometric Models of Forecasting Exchange Rates.

Currency indices are designed to measure changes in the value of the currency. They do that by tracking the exchange rates of currencies that have the highest liquidity on the market. The U.S. Dollar index is the most popular and commonly traded currency index.

The U.S. dollar index is calculated via the following formula: USDX = 50.14348112 × EURUSD^-0.576 × USDJPY^0.136 × GBPUSD^-0.119 × USDCAD^0.091 × USDSEK^0.042 × USDCHF^0.036 (note that when the US dollar is not the base value in the currency cross, the value is negative).

The ICE U.S. Dollar Index is a leading benchmark for the international value of the US dollar and the world's most widely-recognized traded currency index.