Oil and the US Dollar

Why the dollar matters for oil

Almost all international crude trades are invoiced and settled in dollars, and the main futures benchmarks, Brent and WTI, are quoted in dollars. This arrangement dates from the 1970s, when Saudi Arabia and other OPEC producers agreed to price oil in dollars. Exporters' surplus revenue, the so-called petrodollars, was then recycled into US Treasury bonds and other dollar assets.

Dollar pricing creates three channels through which the currency affects the oil price:

• Purchasing power. When the dollar strengthens, oil becomes more expensive in euros, yen or rupees. Demand outside the US weakens at the margin, which weighs on the dollar price.
• Producer costs. Most producers outside the US have costs in local currency. A strong dollar raises their revenue in local terms and makes them more willing to keep pumping.
• Financial flows. Oil is an asset class. When the dollar falls, investors often buy commodities as a hedge against currency weakness and inflation. A strong dollar often goes with higher US interest rates, which make holding commodities less attractive.

The DXY and the broad dollar index

The US Dollar Index (DXY), traded on ICE, measures the dollar against six currencies: the euro (57.6% weight), Japanese yen (13.6%), British pound (11.9%), Canadian dollar (9.1%), Swedish krona (4.2%) and Swiss franc (3.6%). It was set at 100 in March 1973. Because it leaves out China, India and other large oil importers, economists often prefer the Federal Reserve's nominal broad dollar index, which covers 26 currencies weighted by trade. That index stood at 121.60 on 9 October 2026, up from 117.82 on 27 February 2026, the last trading day before the Iran war began (FRED series DTWEXBGS).

The correlation: strong most years, broken in 2024–2026

When the inverse relationship breaks

The inverse link holds best when both oil and the dollar react to the same global growth and interest-rate news. It weakens or flips in three situations:

1. Supply shocks. A war or an outage pushes oil up on its own. In 2026 the disruption in the Strait of Hormuz lifted oil, while the dollar also gained as a safe haven. Brent spot rose from about $71 in February 2026 to an average of $114.16 in September (EIA), and the broad dollar index rose about 3% over the same period.
2. The US as a net exporter. The United States now exports more petroleum than it imports, a net export position the EIA puts at about 4.3 million b/d in 2026. Higher oil prices improve the US trade balance and can support the dollar rather than weaken it.
3. Inflation and interest rates. An oil shock raises inflation. If markets expect the Federal Reserve to keep rates higher for longer, or to raise them, the dollar strengthens alongside oil. The Fed raised its target range by 0.25 percentage points to 3.75%–4.00% on 17 September 2026. See oil prices and inflation.

What a strong dollar means for importers

For countries that buy oil in dollars, the local price depends on both the dollar oil price and their exchange rate. When oil and the dollar rise together, as in 2026, importers are hit twice. The Indian rupee fell to a record low against the dollar in late March 2026, according to the IEA, just as Brent passed $100. Japan, which imports almost all its crude, faces a yen rate of about 158 per dollar in October 2026, based on ECB reference rates. Use the converter below to see the local price.

How to use the dollar when reading the oil market

• Check whether a move in oil is shared by other commodities such as gold and copper. If so, the dollar or general risk appetite may be the cause.
• Compare oil in several currencies. A rally that appears only in dollars is a currency story; a rally in every currency is an oil story.
• Watch US interest-rate expectations. Fed decisions and inflation data often move the dollar and oil at the same time.
• Remember that the correlation changes over time. Use it as context alongside inventories, OPEC+ policy and the other drivers of oil prices.