Dollar Index (DXY)

The Dollar Index (DXY), also known as the U.S. Dollar Index or USDX, is a measure of the value of the United States dollar relative to a basket of six major world currencies. Created in 1973 by the Intercontinental Exchange (ICE) shortly after the dissolution of the Bretton Woods system, it provides a single figure that captures the dollar's overall strength or weakness against its most important trading partners.

The DXY basket consists of six currencies with the following fixed weightings:

• Euro (EUR): 57.6% — the dominant component by far
• Japanese Yen (JPY): 13.6%
• British Pound (GBP): 11.9%
• Canadian Dollar (CAD): 9.1%
• Swedish Krona (SEK): 4.2%
• Swiss Franc (CHF): 3.6%

The index was originally set at a base value of 100.000 in March 1973. A reading above 100 indicates the dollar has strengthened relative to its 1973 baseline, while a reading below 100 indicates weakening. Over its history, the DXY has ranged from a low of approximately 70.7 in 2008 to a high of roughly 164.7 in 1985.

A key limitation of the DXY is that its basket composition has not been updated since the euro replaced multiple European currencies in 1999 (inheriting their combined weight). Notably, the index does not include the Chinese yuan, Australian dollar, South Korean won, or other currencies that have become major U.S. trading partners. This has led some institutions to develop alternative trade-weighted dollar indices that better reflect current global trade patterns, such as the Federal Reserve's Broad Trade-Weighted Dollar Index.

Despite its limitations, the DXY is enormously influential in financial markets. It is widely used by forex traders to gauge overall dollar momentum, by commodity traders (since most commodities are priced in dollars, a stronger DXY typically pressures commodity prices), and by equity analysts assessing the impact of dollar movements on multinational corporate earnings. The DXY also trades as a futures contract on the ICE exchange, allowing direct speculation on overall dollar direction.

Traders often watch key technical levels on the DXY as confirmation signals for individual currency pair trades. A breakout above resistance on the DXY can reinforce bearish signals on EUR/USD, GBP/USD, and other dollar-denominated pairs simultaneously.