DXY Dollar Index — live synthetic
The ICE-standard US Dollar Index, computed live from its six component currency pairs. Refreshed every minute server-side. Daily history covers the last ~90 business days.
Formula
DXY = 50.14348112 × EURUSD^-0.576 × USDJPY^0.136
× GBPUSD^-0.119 × USDCAD^0.091
× USDSEK^0.042 × USDCHF^0.036
Constant 50.14348112 was set in March 1973 so the index equalled 100 at the start of the floating-rate era. Weights are the ICE / Federal Reserve trade-weighted weights — frozen since 1999, when the euro replaced its predecessor basket of European currencies.
Components
| Pair | Spot | Contribution today (bp) |
|---|---|---|
EURUSD |
1.15226 | +0.0 bp |
USDJPY |
160.280 | +0.0 bp |
GBPUSD |
1.33296 | +0.0 bp |
USDCAD |
1.39373 | +0.0 bp |
USDSEK |
9.46387 | +0.0 bp |
USDCHF |
0.79542 | +0.0 bp |
Contribution (basis points) is each pair's weighted log-return between its prior daily close and the current spot. Sum of contributions ≈ today's DXY % change. Pairs with negative weights (EUR, GBP) push DXY down when they rise — a stronger euro or sterling means a relatively weaker dollar.
What DXY tells an FX trader
DXY is a single-number summary of the dollar's price against a fixed basket of developed-market currencies — 57.6% euro, 13.6% yen, 11.9% sterling, 9.1% Canadian dollar, 4.2% Swedish krona, 3.6% Swiss franc. Because EUR/USD dominates the basket, DXY is in practice a slightly cleaner inverse of EUR/USD with some yen and sterling texture.
When DXY breaks a multi-month high, USD strength is regime-level — every USD pair is affected, and even the non-USD crosses move in response to USD-driven risk flows. Conversely, a sustained DXY breakdown often coincides with risk-on phases that lift commodity currencies and emerging-market FX.
For sizing: pair the DXY chart with the broader currency-strength meter for the full 8-currency picture, or with the pair correlation matrix to see which crosses are currently most sensitive to USD moves. Once you have the directional view, the position-size calculator turns it into a risk-bounded entry.
FAQ
What is DXY?
DXY is the ICE US Dollar Index, a weighted geometric mean of the dollar's exchange rates against six developed-market currencies. It was launched by the Federal Reserve in March 1973, shortly after Bretton Woods ended; the index is now maintained and traded as a futures contract by ICE.
How is DXY calculated?
DXY = 50.14348112 × EURUSD-0.576 × USDJPY0.136 × GBPUSD-0.119 × USDCAD0.091 × USDSEK0.042 × USDCHF0.036. The exponents are the basket weights; the constant sets the index to 100 at the March 1973 baseline. The formula is public and unchanged since 1999.
Why only six currencies?
The basket was set in 1973 to reflect the US's major trading partners at the time, and froze at six when the euro replaced four legacy European currencies in 1999. It does not include the Chinese yuan, Mexican peso, or other modern major US trade partners — which is why the broader Fed trade-weighted index (TWEXB) often diverges meaningfully from DXY.
How does DXY relate to EUR/USD?
EUR is 57.6% of the DXY basket, with a negative weight (because EUR/USD is quoted as "dollars per euro," not the reverse). DXY and EUR/USD therefore move strongly inversely day-to-day, typically with a correlation of −0.95 or better. If you only watch one of them you're missing little information; if you watch both, EUR/USD shows the leading edge and DXY shows the regime context.
Is this the same DXY that ICE publishes?
Same formula, same component pairs, computed from the same kind of spot rates. Small differences (typically <0.05% drift) come from spot timing — our values sample minute-by-minute from one data feed, ICE's official DXY uses its own continuous fixing methodology. For directional and level context they are equivalent.