US Dollar Index (DXY) Explained
The US Dollar Index (DXY or USDX) measures the value of the US dollar against a basket of six major currencies. It is the primary benchmark for USD strength or weakness — and because the USD is the world's reserve currency, DXY moves affect virtually every forex pair, gold, oil, and global equity markets simultaneously.
How DXY Is Calculated
The DXY is a geometrically weighted index of USD against 6 currencies:
| Currency | Weight |
|---------|--------|
| EUR (Euro) | 57.6% |
| JPY (Japanese Yen) | 13.6% |
| GBP (British Pound) | 11.9% |
| CAD (Canadian Dollar) | 9.1% |
| SEK (Swedish Krona) | 4.2% |
| CHF (Swiss Franc) | 3.6% |
The EUR dominance problem: Because EUR makes up 57.6% of DXY, EUR/USD movement drives most of the index. DXY going up roughly means EUR/USD is falling and/or JPY and GBP are weakening against USD.
Starting point: DXY was established at 100 in March 1973 when the Bretton Woods system ended. Above 100 = USD stronger than 1973 baseline. Below 100 = weaker.
Historical range: DXY has traded between approximately 70 (2008 low) and 165 (1985 high). Recent range: 89–115 (2020–2023).
DXY and Its Correlations
DXY vs EUR/USD: Strong inverse correlation (−0.90 to −0.99). EUR/USD is essentially an inverted DXY chart. When DXY rises, EUR/USD falls.
DXY vs Gold (XAU/USD): Strong inverse correlation (typically −0.7 to −0.9). Gold is priced in USD — a stronger dollar makes gold more expensive in other currencies, reducing demand → gold falls. When DXY falls, gold typically rises.
DXY vs Oil: Moderate inverse correlation. Oil is priced in USD globally. Strong dollar makes oil more expensive for non-USD buyers → demand falls → oil falls. Correlation is not as tight as gold due to supply-side factors.
DXY vs EM currencies: Strong inverse correlation. USD/INR, USD/PKR, USD/IDR all rise when DXY rises (EM currencies weaken). This is one of the most reliable macro relationships in forex — DXY direction predicts EM currency direction consistently.
Practical use: Check DXY direction before trading any USD pair. If DXY is strongly trending up, bias should be long USD across the board. Do not buy EUR/USD when DXY is strongly bullish.
How to Trade DXY
Direct DXY trading: DXY futures trade on the ICE exchange (US Dollar Index futures, DX). DXY ETFs exist: UUP (bullish), UDN (bearish). These are US-listed instruments accessible through stock brokers.
Indirect DXY trading (most common approach):
Since EUR/USD is 57.6% of DXY, trading EUR/USD is effectively a high-correlation DXY trade. For broader USD exposure:
- Short EUR/USD + short GBP/USD simultaneously
- Long USD/JPY + long USD/CHF
Reading DXY levels:
- 100: Psychological round number, historically significant
- 103–106: The "neutral zone" for recent years
- Above 110: Strong dollar regime (negative for EM, gold, commodities)
- Below 96: Weak dollar regime (positive for EM, gold, commodities)
Key DXY chart levels (2024–2025 context): Support in the 100–101 zone; resistance around 106–107 (2023 high). A DXY break above 107 signals continued dollar strength; break below 100 signals potential extended USD weakness and gold/EM rally.
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