US Dollar Index (DXY)
Also known as: dollar index, USDX, trade-weighted dollar, the dollar index
What is it?
The US Dollar Index is a single number tracking the dollar against a fixed basket of six currencies, so one chart shows whether the dollar is broadly strong or weak instead of only how it fared against one counterpart. The basket's weights matter far more than most traders realise. The euro alone carries 57.6 percent of the index, with the Japanese yen at 13.6, the British pound at 11.9, the Canadian dollar at 9.1, the Swedish krona at 4.2 and the Swiss franc at 3.6.
| Currency in the basket | Weight | What it means for your read |
|---|---|---|
| Euro (EUR) | 57.6% | Most DXY moves are really euro moves |
| Japanese yen (JPY) | 13.6% | Adds a risk-sentiment leg to the index |
| British pound (GBP) | 11.9% | A second European input on top of the euro |
| Canadian dollar (CAD) | 9.1% | The only commodity currency present |
| Swedish krona (SEK) | 4.2% | Barely moves the index |
| Swiss franc (CHF) | 3.6% | Barely moves the index |
| Not in the basket | 0% | CNY, MXN, BRL, ZAR, INR, KRW |
Add the euro, pound and krona together and roughly three-quarters of the index is European. A 0.5 percent DXY move is therefore very often a euro move wearing a dollar label. That composition is also what the index is not.
It contains no Chinese yuan, no Mexican peso and no emerging-market currency at all, and its weights have not been rebalanced since the euro replaced its predecessor currencies in 1999. If your trade is in USD/MXN or USD/CNH, DXY is a rough proxy at best. Read it as a fast take on broad dollar direction and a useful confirmation tool, never as a precise measure of the dollar's global value.
Why it matters: DXY gives you one chart for broad dollar direction, but its 57.6 percent euro weighting means a DXY move is often a euro move in disguise.
DXY = 50.14348112 x (EUR/USD^-0.576 x USD/JPY^0.136 x GBP/USD^-0.119 x USD/CAD^0.091 x USD/SEK^0.042 x USD/CHF^0.036)
Using DXY to confirm a trade in a pair the index barely represents produces false confirmation, most often on emerging-market and commodity pairs.
Real-world example
A trader used a DXY breakout to confirm a short in USD/MXN. The index had risen almost entirely on euro weakness after a European Central Bank decision, while the peso strengthened on its own rate story, and the trade went the wrong way.
How SignalBots handles it
SignalBots publishes dollar-pair signals individually, so you can compare a broad DXY read against the specific pair a setup names rather than assuming the two agree. See /risk-warning.
Pro tip
Before treating a DXY move as dollar strength, check EUR/USD. If the euro leg explains most of the move, what you are reading is a euro signal, not a dollar one.
Common pitfalls
Treating DXY as the dollar's global value and applying it to yuan, peso or rand pairs that are not in the basket at all.
Frequently asked questions
Which currencies are in the DXY basket?
Six: the euro at 57.6 percent, the Japanese yen at 13.6, the British pound at 11.9, the Canadian dollar at 9.1, the Swedish krona at 4.2 and the Swiss franc at 3.6 percent.
Why is the euro weighted so heavily?
The weights were set from 1970s trade flows, then the euro's predecessor currencies -- the mark, franc, lira, guilder and others -- were folded into a single euro slot in 1999. The euro inherited all of their combined weight and has kept it since.
Is DXY the same as the Federal Reserve's trade-weighted index?
No. The Fed's broad index covers far more currencies, including the yuan and the peso, and is rebalanced using current trade data. DXY is the older, narrower and directly tradeable version.
Can I trade DXY directly?
Yes, through futures, some CFD brokers and index funds, though availability varies by broker and region. Many traders use it purely as a reference chart and take their actual positions in individual pairs.
What does a rising DXY mean for my trades?
Broadly it favours shorts in EUR/USD, GBP/USD and AUD/USD and longs in USD/JPY and USD/CHF, but confirm against the individual pair, because a basket move does not guarantee every leg moved. Your capital is at risk.
Trading involves substantial risk of loss. Historical and backtested results do not guarantee future performance. Read the full risk warning.
