What it means
DXY is the US Dollar Index, a weighted geometric mean of the dollar's value against six currencies: EUR (57.6% weight), JPY (13.6%), GBP (11.9%), CAD (9.1%), SEK (4.2%), CHF (3.6%). It is the most-watched single ticker for the dollar trade. Calculated continuously by ICE since 1973 with a base value of 100.
Why it matters
DXY direction sets the tone for virtually every other asset class. Commodities (priced in USD) move inversely. Emerging market debt and equities react. Gold trades against real rates but is heavily filtered through DXY. Every macro thesis ultimately routes through dollar direction.
How to use it
Combine DXY with the 2-year US yield (DXY tracks the policy-rate differential most strongly through the front of the curve). Use ETF UUP for long-DXY exposure, UDN for short. Watch DXY breaking 105 or 100 as regime-change levels — multiple asset classes reprice when DXY clears those.
DXY rallied from 95 to 114 in 2022 as the Fed hiked 425bp while ECB lagged. EM equity (EEM) fell 21% in the same window. Gold (GLD) fell 12%. Bitcoin fell 64%. Every cross-asset thesis that quarter was effectively a DXY trade.
How DXY is calculated and what's in the basket
DXY uses a geometric weighted mean of six currency exchange rates: EUR (57.6%), JPY (13.6%), GBP (11.9%), CAD (9.1%), SEK (4.2%), CHF (3.6%). The basket was set in 1973 to reflect US trade composition then, and has not been rebalanced. Notable absence: CNY (China became major US trading partner only after 1990). The methodology overweights EUR materially — a 1% move in EUR/USD moves DXY about 0.55 points, while a 1% move in CHF/USD moves it only ~0.03 points.
DXY vs Trade-Weighted Dollar (TWD)
The Federal Reserve publishes its own Trade-Weighted Dollar Index that rebalances annually and includes CNY, MXN, BRL and other major US trading partners. The TWD is more representative of actual US trade flows but less liquid as a tradable instrument. DXY remains the markets standard for one reason: ICE futures (DX contract) and ETFs (UUP) trade DXY, not TWD. Liquidity wins.
- DXY: 6 currencies, fixed 1973 weights, futures available (DX)
- TWD: ~26 currencies, annually rebalanced weights, Fed publishes only
- BIS effective exchange rate: similar broad-basket measure
- ICE DXY futures (DX): ~25,000 contracts daily, very liquid
What drives DXY
Three primary drivers: (1) rate differentials, with the US 2-year yield vs G10 2-year yields setting the medium-term level; (2) risk regime, where DXY rallies in global risk-off as the dollar bid for safety overwhelms other factors; (3) US relative growth, when US data outperforms peer economies, capital flows into US assets and lifts DXY. The relative importance of each shifts with the regime: 2022 was rate-differential, 2020 was risk-regime, 1995 was relative growth.
DXY levels that matter
Three psychological levels worth marking: 100 (the inception baseline, sentiment line), 105 (multi-year resistance/support broken), 114 (2022 peak post-Fed-hike cycle). Each has been retested multiple times. Crossing these levels typically resets positioning across multiple asset classes within 1-2 weeks. The 2022 break above 114 was the level that signaled the EM-stress narrative that defined that year.
DXY × asset-class correlations
Stable historical correlations to anchor cross-asset trades: DXY vs gold (GLD) ≈ -0.7, DXY vs EM equity (EEM) ≈ -0.65, DXY vs copper (HG) ≈ -0.55, DXY vs US 10-year yield (^TNX) ≈ +0.4 (varies by regime), DXY vs Russell 2000 (IWM) ≈ -0.3. Correlations are 60-day rolling and not stable in extremes — during 2020 March they collapsed when everything sold off simultaneously.
How to position with DXY
Three position structures. (1) Directional: long UUP or DX futures for long DXY, UDN or short DX for short DXY. (2) Cross-asset hedge: if you're long EM equities (EEM), shorting UUP hedges the dollar leg. (3) Volatility: when DXY breaks a multi-year level, expect 2-4 weeks of follow-through. The mistake is fading every DXY move; trends in the dollar last months, not days.
Frequently asked
What does it mean when DXY is high?
A high DXY means the US dollar is strong relative to the six basket currencies. Typically a sign of Fed hawkishness, US growth outperformance, or global risk-off. Strong DXY pressures commodities, EM, and US mega-cap multinationals.
Can I trade DXY directly?
Yes, through ICE futures (DX contract) for institutional, or ETFs UUP (long) and UDN (short) for retail. Direct DXY exposure has lower correlation to any single currency pair than trading EUR/USD or USD/JPY individually.
Why doesn't DXY include the Chinese yuan?
DXY's basket was set in 1973 when China was barely a US trading partner. The basket has not been rebalanced. The Fed's Trade-Weighted Dollar Index includes CNY and is more representative of current trade composition, but DXY remains the market standard because of its futures liquidity.
How does DXY relate to EUR/USD?
EUR has 57.6% weight in DXY, so EUR/USD drives most of DXY's daily move. A 1% rally in EUR/USD typically pushes DXY down about 0.55 points. The two are inversely correlated at roughly -0.95 on a daily basis.
What was the all-time high and low for DXY?
All-time high: 164.72 on 25 February 1985, before the Plaza Accord coordinated dollar weakening. All-time low: 71.32 on 23 April 2008, during the global financial crisis. The modern range has been 70-115.
Is DXY a good proxy for the overall dollar trade?
It's the best widely-traded one but imperfect. The fixed 1973 weights overrepresent EUR and underrepresent Asia. For institutional macro analysis, the Fed's Trade-Weighted Dollar or BIS effective exchange rate is preferred. For trading and quick-glance signal, DXY is unmatched.
Want a worked example or a deeper dive? Ask Rocky how this concept applies to your specific watchlist or trade idea.
Ask Rocky