Commodity currencies: How oil, gold and iron ore move AUD, CAD and NOK

In the forex market, some currencies behave almost like a proxy for the raw materials their countries export. The Australian dollar, the Canadian dollar and the Norwegian krone are the best-known examples. When the price of iron ore, crude oil or natural gas moves, these currencies often move with it.

Explains what a commodity currency is and why a country's export structure can shape the value of its currency.

Discusses the links between AUD and iron ore, CAD and crude oil, and NOK and North Sea energy.

Explores why these relationships are strong but not permanent, and what else traders watch alongside commodity prices.

What is a commodity currency?

A commodity currency is the currency of a country whose economy depends heavily on the export of raw materials. When commodity prices rise, more foreign money flows in to pay for exports and the central bank often has room to keep rates higher, so the currency tends to strengthen. When prices fall, the process reverses.

The most commonly cited commodity currencies are the Australian dollar (AUD), the Canadian dollar (CAD), the Norwegian krone (NOK) and the New Zealand dollar (NZD). Each is tied to a different set of raw materials, which is why they do not always move together.

Commodity prices are only one of several drivers. Interest rates, inflation, global risk appetite and the strength of the U.S. dollar all play a role, and at times they matter more than the commodity itself.

The three main examples

Australian dollar and iron ore

Australia is the world's largest exporter of iron ore, with China as its dominant buyer. This makes AUD sensitive to two things at once: the price of iron ore and the state of the Chinese economy. When Chinese construction and steel production are strong, AUD often benefits. When China slows, AUD frequently comes under pressure, even if nothing has changed inside Australia. Coal, gas and gold add to this picture.

Canadian dollar and crude oil

Canada is among the largest crude oil producers in the world, and most of its energy exports go to the United States. CAD has historically shown a visible correlation with oil: expensive crude has often coincided with a stronger CAD, and sharp oil sell-offs with a weaker one. The 2020 oil crash and the price spikes in 2022 and 2026 show how energy shocks can filter through to USD/CAD. The relationship is not mechanical, however. Bank of Canada rate decisions and U.S. data regularly override the oil signal in the short term.

Norwegian krone and North Sea energy

Norway is Western Europe's largest oil and gas producer. Energy exports fund a large share of the state budget and the country's sovereign wealth fund, which is why NOK is often watched as a European energy proxy. When Brent crude and European gas prices rise, NOK tends to attract interest; when they fall, the krone often gives ground.

Why the correlation is strong but not permanent

The link between a commodity and its currency can weaken or break for extended periods:

Interest rate differentials. If the Federal Reserve raises rates faster than the Reserve Bank of Australia or the Bank of Canada, the U.S. dollar can strengthen against AUD and CAD regardless of commodity prices.

Risk sentiment. Commodity currencies are often treated as "risk-on" assets. In a global sell-off, investors may exit them for the U.S. dollar, Swiss franc, or Japanese yen, even when commodities are holding up.

Domestic factors. Housing markets, fiscal policy, and local data can push a currency where the commodity price alone would not suggest.

Structural change. Export mixes evolve, and a currency that tracked one commodity a decade ago may respond to different drivers today.

Conclusion

Commodity currencies sit at the intersection of the forex and raw materials markets. AUD reflects iron ore and Chinese demand, CAD reflects crude oil and its ties to the U.S. economy, and NOK reflects North Sea energy. These relationships are among the most closely watched in forex, but they are shaped by interest rates, risk appetite, and domestic conditions as well. Recognizing how raw materials feed into exchange rates is a useful step toward understanding why currencies move the way they do.