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Use EUR/USD to measure how the euro is moving against the U.S. dollar. Use the European Central Bank’s euro effective exchange rate (EER/NEER) to assess the euro against a broader group of trading partners, and a real effective exchange rate (REER) when the question is price or cost competitiveness. A dollar index such as ICE’s DXY is dollar-centered and includes a large euro component, so it is not an independent measure of euro-wide weakness.
Choose the measure that matches what “weakness” means
There is no single exchange-rate series that answers every question about a currency. Start by defining the comparison:
- Fewer dollars for one euro: check EUR/USD.
- Less value against a range of euro-area trading partners: check the ECB’s nominal effective exchange rate (NEER), also called an effective exchange rate (EER).
- Less price or cost competitiveness: check a real effective exchange rate (REER), which adjusts an effective exchange rate for relative prices or costs.
These indicators are related, but they are not interchangeable: they have different reference currencies or baskets and answer different questions.
What EUR/USD tells you
EUR/USD is the direct bilateral exchange rate between the euro and the U.S. dollar. If the rate falls, one euro buys fewer dollars; if it rises, one euro buys more dollars. That makes it the clearest indicator when the claim is specifically that the euro has weakened against the dollar.
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A bilateral rate cannot establish whether the euro has weakened against currencies more broadly. The euro could move differently against the dollar, yen, pound, or other trading-partner currencies. For a dated official reference, the ECB page displayed EUR 1 = USD 1.1269 for 6 October 2026. That is an ECB reference-rate observation, not a live trading quote or evidence of a broader trend: ECB euro reference exchange rates.
Why DXY is not a standalone euro-weakness gauge
ICE’s U.S. Dollar Index (USDX), commonly called DXY, measures the dollar against a fixed basket of six currencies. The euro has a 57.6% weight, so euro movements can have a substantial influence on DXY. But the index also moves with its other constituents, and its perspective is the U.S. dollar’s value against that basket—not the euro’s value against all of its trading partners.
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| Currency in ICE’s DXY basket | Published weight |
|---|---|
| Euro (EUR) | 57.6% |
| 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% |
ICE describes USDX as “a geometrically averaged calculation of six currencies weighted against the U.S. dollar.” Its euro-related exposure has remained fixed at 57.6%; the basket’s composition changed when the euro launched in January 1999 and replaced several European currencies. See ICE’s USDX description.
Because the euro is such a large component, DXY can provide context for dollar strength against its basket, but it does not independently confirm that the euro is weak across a broad set of currencies. Movements in the other five currencies also affect the index.
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When to use the ECB’s effective exchange rates
The ECB’s broad daily euro NEER measures the euro against 40 trading partners. Its weights reflect trade in manufactured goods and services, including third-market effects, and are updated over time. The current methodology incorporates reference periods 2022–24, with updated trade weights dated 1 January 2026. The ECB also publishes daily nominal indices for 12 and 17 partners.
Because the measure is euro-centered and covers many trading partners, NEER is better suited than EUR/USD or DXY to a question about the euro’s nominal external value more broadly. It still measures exchange rates, not whether goods and services have become more or less competitive after changes in relative prices. Method details and series are available on the ECB euro effective exchange rates page.
When a real effective exchange rate is more useful
A REER adjusts a nominal effective exchange rate using a selected price or cost measure. It is therefore relevant when the question concerns international price or cost competitiveness rather than just nominal currency movements. The result depends on the chosen deflator, so check which price or cost measure a particular series uses before comparing values.
The ECB explains the distinction in its effective exchange rate explainer; the European Commission also describes real effective rates in its price and cost competitiveness material.
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Do not confuse DXY with the Federal Reserve’s broad dollar index
The Federal Reserve’s broad dollar index is a different series from ICE’s DXY. The Fed describes its broad index as a weighted average against a broad group of U.S. trading partners and separately publishes advanced-economy and emerging-market indexes. It also provides nominal and real index series. Its currency weights were last revised on 24 March 2025, according to the H.10 page, which was last updated 5 October 2026.
The breadth of the Fed’s measure makes it useful for examining the dollar against a wider set of U.S. trading partners, but it remains a dollar-centered index. A broad dollar move is not the same as the euro’s bilateral move or its effective value. Consult the Federal Reserve H.10 dollar indexes and weights for definitions and data.
How broad indexes can conceal bilateral moves
A basket index can appear stable even when the dollar moves notably against an individual currency, because gains and losses against different currencies can offset. In its 13 August 2026 report on Q2, the Federal Reserve Bank of New York described the broad trade-weighted dollar index as little changed overall, even though the dollar appreciated against advanced-economy currencies including the euro and depreciated against some emerging-market currencies. That dated example illustrates why a broad dollar index should not replace the EUR/USD series when the question is specifically about the euro-dollar pair. See the New York Fed’s Q2 2026 report.
A practical comparison
| Measure | Perspective and coverage | Best suited to | Important limitation |
|---|---|---|---|
| EUR/USD | Euro against the U.S. dollar only | Whether the euro is gaining or losing dollar value | Does not show the euro’s value against a wider currency group |
| ICE DXY/USDX | U.S. dollar against six currencies, including the euro at a fixed 57.6% weight | Dollar performance against ICE’s basket | Dollar-centered, fixed-weighted, and strongly influenced by EUR/USD |
| Federal Reserve broad dollar index | U.S. dollar against a broad group of U.S. trading partners | Broader dollar performance, with separate advanced- and emerging-economy series | Still measures the dollar, not the euro’s broad external value |
| ECB NEER/EER | Euro against a trade-weighted group of partners; broad daily index covers 40 | Nominal euro performance across trading partners | Does not itself adjust for relative prices or costs |
| REER | Effective exchange rate adjusted for a selected price or cost measure | Price or cost competitiveness | Interpretation depends on the deflator used |
Using official exchange-rate data carefully
The ECB’s euro reference rates are published for information, not as transaction quotes. The ECB strongly discourages using them for transactions; rates are usually updated around 16:00 CET on working days. For a currency exchange, transfer, or investment decision, check the rate actually offered by the provider and any fees rather than treating the ECB reference observation as executable pricing. See the ECB reference-rate page and its usage notice.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesFor dollar-index context, the New York Fed reported that its broad trade-weighted dollar index appreciated 1.1% in Q1 2026, following a cumulative 7.4% depreciation in 2025. Those are dollar-index figures, not measures of euro weakness. The Fed notes that exchange rates are market-determined and that neither the U.S. Treasury nor Federal Reserve targets a level for the exchange rate; see its exchange-rate FAQ.
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