For educational purposes only; not investment advice. Investing may result in loss.
Direct answer
The ICE U.S. Dollar Index, commonly identified by DXY or USDX, is a geometric index of the U.S. dollar against six currencies. It began at a base value of 100.000 in March 1973 and currently uses fixed legacy weights:
- Euro (EUR):
57.60% - Japanese yen (JPY):
13.60% - British pound (GBP):
11.90% - Canadian dollar (CAD):
9.10% - Swedish krona (SEK):
4.20% - Swiss franc (CHF):
3.60%
DXY is a useful, tradable benchmark, but it is not a comprehensive measure of the dollar against every currency or current U.S. trade. It excludes, among others, the Chinese yuan, Mexican peso, South Korean won, Indian rupee, Australian dollar, and Brazilian real. The Federal Reserve’s broader dollar indexes use different, more extensive trade-weighted baskets.
For a company or investor, DXY is context rather than a substitute for mapping the actual currencies, timing, accounting treatment, and hedges of each exposure.
How DXY is calculated and transmitted
ICE publishes the index using the following construction:
DXY = 50.14348112 x EURUSD^-0.576 x USDJPY^0.136 x GBPUSD^-0.119 x USDCAD^0.091 x USDSEK^0.042 x USDCHF^0.036
The signs reflect quotation direction. In EURUSD and GBPUSD, the dollar is the quote currency, so those terms have negative exponents: a lower pair value means a stronger dollar and a higher DXY. In USDJPY, USDCAD, USDSEK, and USDCHF, the dollar is the base currency, so a higher pair value raises DXY.
Because the index is geometric, a component’s percentage move affects DXY approximately by its signed weight for small moves, but the exact effect is multiplicative. The euro’s 57.60% weight makes DXY heavily sensitive to EUR/USD without making DXY identical to that currency pair.
Corporate currency exposure has several forms:
- Transaction exposure arises from contracted foreign-currency receivables, payables, debt, and other monetary balances.
- Translation exposure arises when foreign operations’ financial statements are converted from functional currencies into the reporting currency.
- Economic exposure reflects longer-run effects on prices, demand, sourcing, competition, and cash flows.
A U.S. reporter can face a translation headwind when foreign revenue converts into fewer dollars, but the net economic effect depends on revenue, cost, asset, liability, financing, and hedge currencies. Matching local revenue with local costs or debt can create a partial natural hedge.
The cash index and ICE dollar-index futures are related but not identical instruments. Futures prices are market prices for dated contracts and incorporate interest-rate differentials, time to expiry, liquidity, and other contract mechanics.
Worked index and business examples
Index construction
Assume the following illustrative spot rates: EURUSD = 1.08, USDJPY = 150.00, GBPUSD = 1.27, USDCAD = 1.35, USDSEK = 10.50, and USDCHF = 0.88. Applying the ICE formula gives:
DXY = 104.0662
If only EUR/USD falls by 5.00%, from 1.08 to 1.026, the exact index effect is:
(1.026 / 1.08)^-0.576 - 1 = 2.9986%
Illustrative DXY rises to:
104.0662 x (1 + 2.9986%) = 107.1867
If instead only USD/JPY rises by 10.00%, the index effect is:
1.10^0.136 - 1 = 1.3047%
Illustrative DXY becomes 105.4239. These are controlled single-pair scenarios; real components move simultaneously.
Revenue translation
Assume a U.S. company generated US$6.0b of prior-year European revenue. Local-currency revenue grows 8.00%, while the average euro value in dollars is 10.00% lower. A simplified translated result is:
US$6.0b x 1.08 x 0.90 = US$5.832b
Reported dollar growth is:
US$5.832b / US$6.0b - 1 = -2.80%
The business grew 8.00% in local currency but declined 2.80% in reported dollars. Constant-currency growth can help isolate operations, but it is a non-GAAP analytical view that must be reconciled to reported results and does not remove cash, pricing, or competitive FX effects.
Exposure outside DXY
Suppose a borrower earns Mexican pesos but owes US$100m. If USD/MXN rises from 17.00 to 19.00, the local-currency principal equivalent increases from MXN1.70b to MXN1.90b:
MXN1.90b / MXN1.70b - 1 = 11.76%
The Mexican peso is not a DXY constituent, so DXY cannot measure this exposure directly.
Review checklist and analytical risks
- Confirm whether the referenced series is the ICE cash index, a futures contract, an ETF, or another dollar index.
- Record the observation timestamp, source, closing convention, and time zone before comparing levels.
- Use the six fixed DXY weights and correct quote directions rather than treating the index as an arithmetic average.
- Recognize the euro concentration and test whether a DXY move is broad or dominated by EUR/USD.
- Compare DXY with the Federal Reserve broad, advanced-foreign-economy, and emerging-market dollar indexes where relevant.
- Map company revenue, costs, assets, liabilities, debt, and capital expenditure by actual currency.
- Separate transaction, translation, and longer-run economic exposure.
- Identify each entity’s functional currency and the group’s reporting currency.
- Match average rates used for income-statement translation with period-end rates used for relevant balance-sheet items.
- Reconcile constant-currency measures to reported revenue and profit, including the base-period rate convention.
- Separate volume, price, mix, acquisition, disposal, and currency effects instead of assigning every difference to FX.
- Review gross and net hedge notionals, instruments, maturities, counterparties, collateral, costs, and accounting designation.
- Test natural hedges rather than assuming foreign revenue is an unhedged net exposure.
- Examine dollar debt relative to local-currency cash generation, reserves, refinancing, and capital controls.
- Treat commodity prices as driven by supply, demand, inventories, geopolitics, real rates, and positioning as well as currency.
- Translate asset returns multiplicatively into the investor’s home currency rather than adding percentage moves.
- Account for dividends, withholding tax, hedge carry, transaction costs, and basis when measuring investor returns.
- Distinguish correlation from causation when linking DXY to stocks, rates, commodities, or risk sentiment.
- Stress currencies excluded from DXY, especially when they dominate the company’s operations or financing.
- Use scenario ranges and matched-period data rather than inferring a stable sensitivity from one episode.
Common misconceptions
- “DXY measures the dollar against the world.” It measures a fixed six-currency basket with a large euro weight and omits many major trading partners.
- “DXY up means the dollar rose against every currency.” Basket currencies can move in different directions, and excluded currencies can behave very differently.
- “A stronger dollar automatically lowers every U.S. multinational’s profit.” Revenue translation can be negative while local costs, dollar inputs, hedges, pricing, and competitive effects offset or reverse the net impact.
- “Commodities must fall whenever DXY rises.” Dollar denomination can matter, but physical fundamentals and financial conditions can dominate.
- “Constant-currency growth is the cash result.” It is an analytical comparison; reported statements, settlement rates, hedging, taxes, and actual cash conversion still matter.