The U.S. Dollar Index—commonly called DXY or USDX—is a fixed, geometrically weighted measure of the dollar against six currencies. It is useful for seeing a specific set of major-currency moves in one number. It is not a broad, annually updated map of every important U.S. trade relationship.
That distinction is the practical answer to the common question “what does DXY measure?” The euro alone has a 57.6% weight, while the Japanese yen has 13.6%. China’s yuan, Mexico’s peso and many other currencies that matter to U.S. trade are not components. A DXY move can therefore be meaningful without being a complete verdict on the dollar’s global trade competitiveness.
Key takeaways
- DXY is a geometrically averaged ICE benchmark built from six currencies: euro, Japanese yen, British pound, Canadian dollar, Swedish krona and Swiss franc.
- Its weights are fixed. The euro accounts for 57.6%, so a euro move has the largest mechanical influence on the index, all else equal.
- ICE says the composition changed once, in January 1999, when the euro replaced several European currencies; the combined European weight remained 57.6%.
- The Federal Reserve’s broad dollar index answers a different question: it uses a wider group of trading-partner currencies and annually revised trade weights.
- Neither index is a currency forecast. First identify the basket and purpose before using a dollar headline to interpret a company, country or portfolio exposure.
DXY is a fixed six-currency benchmark
ICE states that USDX is calculated in real time from spot-price midpoints for its component currencies and is geometrically averaged. “Geometric” means percentage movements combine through weights rather than through a simple arithmetic average. For a reader, the key operational fact is simpler: the basket is fixed, and its components have not been repeatedly rebalanced to reflect contemporary trade.
ICE says the index was introduced in 1973 and its composition changed only once: in January 1999, the euro replaced several individual European currencies. The combined European exposure stayed at 57.6%. That history is why a DXY quote should be read as an established market benchmark with a particular legacy composition, not as a constantly refreshed global dollar survey.
For the exact benchmark definition, use ICE’s USDX page and its USDX brochure. A provider page is a better source than a chart caption or a social-media claim about what is “inside” DXY.
The six currencies—and why the euro dominates
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| DXY component | Fixed weight | Mechanical reading if that currency rises 1% against the dollar, all else equal | What the weight does *not* prove |
|---|---|---|---|
| Euro | 57.6% | DXY would fall by roughly 0.576% | That Europe alone determines all dollar conditions |
| Japanese yen | 13.6% | DXY would fall by roughly 0.136% | That DXY is a yen-only or Japan-only measure |
| British pound | 11.9% | DXY would fall by roughly 0.119% | That sterling is unimportant outside its basket weight |
| Canadian dollar | 9.1% | DXY would fall by roughly 0.091% | That commodity or North American trade exposure is fully captured |
| Swedish krona | 4.2% | DXY would fall by roughly 0.042% | That Sweden’s economy has the same importance as the weight implies |
| Swiss franc | 3.6% | DXY would fall by roughly 0.036% | That safe-haven moves cannot matter outside the index |
*Source: weights from ICE’s U.S. Dollar Index brochure, accessed September 6, 2026. The final column is ATG Press explanatory analysis. The sensitivity figures are small-change, all-else-equal approximations from the published weights, not predictions.*
The direction in the third column matters. Market convention commonly quotes EUR/USD, GBP/USD and similar pairs as U.S. dollars per one unit of the foreign currency. If the euro rises against the dollar while everything else is held constant, the dollar index falls; the euro’s 57.6% weight makes that effect much larger than an equal-sized move in any other component.
The yen connection is real but bounded. A stronger yen can lower DXY, and a weaker yen can lift it, holding the other five currencies constant. Yet a 13.6% yen weight cannot turn DXY into a full measure of Japan’s exchange-rate conditions, Japanese export competitiveness or the dollar’s relationship with all of Asia.
Why DXY and a trade-weighted dollar measure can disagree
The Federal Reserve publishes several dollar indexes under its H.10 release, including a broad dollar index and sub-indexes for advanced and emerging-market economies. The Board describes the broad index as a weighted average against currencies of major U.S. trading partners. Its methodology uses annual bilateral goods-and-services trade data and revises weights annually.
That is structurally different from the six fixed DXY weights. The Federal Reserve’s broad index covers 26 economies under its stated methodology; DXY has six components. The difference does not make one series a universal replacement for the other. It tells the reader to match the index to the question being asked.
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| If the reader wants to know… | More relevant starting point | Why |
|---|---|---|
| How the established six-major-currency DXY basket is moving | ICE USDX / DXY | It is the defined benchmark being discussed in many market headlines and futures references. |
| How the dollar is moving against a wider set of U.S. trading partners | Federal Reserve broad dollar index | Its basket and weights are designed around trade relationships and are revised over time. |
| Whether the yen is moving against the dollar | USD/JPY plus the relevant official or market-data source | DXY contains the yen but is not a bilateral yen measure. |
| Whether a company’s currency exposure is improving or worsening | The company’s filings, guidance and hedge disclosures | No broad index substitutes for the company’s actual sales, costs and hedging mix. |
*Source: ATG Press synthesis of ICE USDX materials and the Federal Reserve H.10 release, accessed September 6, 2026.*
The contrast is especially useful for Japan-connected research. DXY gives the yen a fixed 13.6% role, whereas the Federal Reserve’s current broad-index weights use a broader trading-partner framework. A reader studying a Japanese exporter should still begin with the company’s stated currency assumptions and sensitivities, not infer them from either dollar index.
A careful way to read a DXY headline
1. Name the basket. Confirm that the article is referring to ICE’s six-currency DXY, not a trade-weighted, bank-produced or proprietary dollar measure. 2. Check which component moved. A large euro move can dominate the daily DXY direction. A similar directional move in a non-component currency will not appear directly in the index. 3. Separate currency measurement from business exposure. A company may sell in dollars, source in euros, report in yen and hedge only part of its cash flow. Its filings matter more than an index label. 4. Use the right primary source. ICE is the source for DXY construction; the Federal Reserve’s H.10 release is the source for the Board’s trade-weighted series and weights.
For a separate example of the same discipline—reading the mechanism before assigning a policy meaning—see ATG Press’s Fed balance-sheet guide. A benchmark’s construction can be clear even when the economic interpretation remains conditional.
DXY chart for context
This verified chart is a price-reference tool for the U.S. Dollar Index, not evidence for the basket weights or Federal Reserve methodology. Chart data can be delayed. It should not be read as a forecast or a recommendation to trade a currency product.
Sources
- ICE, U.S. Dollar Index futures, accessed September 6, 2026.
- ICE, U.S. Dollar Index brochure, accessed September 6, 2026.
- ICE, “Managing U.S. dollar risk in uncertain times”, published March 2023; accessed September 6, 2026.
- Federal Reserve Board, H.10 Nominal/Real Indexes, last updated August 31, 2026; accessed September 6, 2026.
- Federal Reserve Board, currency weights, last updated February 2, 2026; accessed September 6, 2026.
- Federal Reserve Board, “Revisions to the Federal Reserve Dollar Indexes”, January 15, 2019; accessed September 6, 2026.
This article is for informational purposes only and does not constitute investment advice.
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