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What actually makes the Strait of Hormuz so important?

Roughly 20 million barrels of oil and oil products move through the Strait of Hormuz every day. That is approximately one-fifth of global oil consumption and roughly one-third of all seaborne oil trade. There is no other waterway on the planet through which this much energy flows.

The strait itself is narrow ‚21 miles wide at its tightest point, with shipping lanes only two miles wide in each direction. Every tanker carrying Saudi, Emirati, Qatari, Kuwaiti, Iraqi, or Iranian oil must pass through it on the way to refineries in Asia, Europe, and North America. There is no alternative route by sea. The geography is not a choice. It is a funnel.

And on one side of that funnel sits Iran.

Why can’t the US just build a pipeline around it?

This is the first question most people ask, and the answer reveals the structural nature of the problem. A handful of bypass pipelines exist‚ notably the UAE’s Habshan-Fujairah line and Saudi Arabia’s East-West (Petroline) pipeline but their combined capacity is only a fraction of Hormuz’s daily throughput.[^3] Building enough new pipeline capacity to replace the strait would take a decade, cost tens of billions of dollars, and still not solve the core problem: the countries that produce the oil are on the Persian Gulf side of the strait. A pipeline across the Arabian Peninsula still has to end at a port, and most of those ports are themselves vulnerable to the same Iranian missile and drone inventory that threatens the strait.

In other words: the chokepoint is not the water. The chokepoint is the geography of production itself.

Could Iran really close the Strait ‚and what would happen if they did?

Iran’s military posture in the Gulf is optimized around exactly one scenario: denying the strait to other navies and to commercial shipping. The Islamic Revolutionary Guard Corps Navy operates hundreds of fast-attack craft, sea mines, and mobile anti-ship missile batteries specifically designed to swarm larger warships and disable tankers.

Most defense analysts agree Iran cannot *permanently* close the strait- a sustained US and allied response would, over weeks, reopen it. The more dangerous question is whether Iran can close the strait *temporarily*, and what a temporary closure would do.

The International Energy Agency has modeled these scenarios. A one-week disruption of Hormuz traffic, during which roughly 70 million barrels of oil fail to reach global markets, would likely push crude above $200 per barrel within days.[^5] Gasoline prices in the United States would spike by $2-$3 per gallon. Airlines, logistics networks, petrochemical supply chains, and industrial production across Asia would absorb the shock first. Recessions have started on less.

This is why the threat of closure is, in itself, Iran’s most valuable strategic asset. They don’t need to close it. They only need everyone to believe they could.

The $50 billion price tag: what America is actually paying for:

The United States maintains the Fifth Fleet at Naval Support Activity Bahrain, rotating carrier strike groups through the Gulf, an expeditionary Marine force, and a permanent air presence across bases in Qatar, the UAE, and Kuwait. The purpose is explicit: keep the strait open.

Estimates of the annual cost vary, but research by the Securing America’s Future Energy initiative and studies from Princeton’s Woodrow Wilson School have placed the figure at roughly $50 billion per year attributable specifically to securing Gulf oil flows. Some analyses go higher. None go meaningfully lower.

The striking thing about this arrangement is that the United States imports very little Gulf oil directly anymore. Since the shale revolution, the US has been a net petroleum exporter. So who is America actually guarding the strait *for*?

The answer is: for the global oil market, which is priced in US dollars. And that is where the petrodollar comes in.

The Petrodollar: the deal that turned oil into a dollar-denominated weapon

In 1974, in the aftermath of the Nixon shock that ended the gold standard and the OPEC oil embargo that tripled crude prices, the United States and Saudi Arabia arrived at an informal arrangement. Saudi Arabia would price its oil exclusively in US dollars. In exchange, the United States would provide military protection for the Kingdom and, by extension, for the oil flowing out of the Gulf.

This arrangement later extended across OPEC had two enormous consequences. First, it created permanent global demand for US dollars, because every country that imported oil had to hold dollars to pay for it. This is what allowed the US to run persistent trade deficits without collapsing its own currency. Second, it tied the stability of the entire dollar-denominated financial system to the geography of one narrow strait.

The $50 billion a year America spends patrolling Hormuz is, in effect, the maintenance cost of the dollar’s reserve-currency status. It is also the reason why, every time Iran rattles its sabers in the Gulf, the price of US Treasury bonds and the value of the dollar move in sympathy. A threat to the strait is a threat to the dollar. And a threat to the dollar is a threat to every asset priced against it.

Where this leaves us in 2026

Three structural shifts have been reshaping this picture over the last decade. China now imports more than half of the oil that transits the strait.[^8] Saudi Arabia has begun settling some of its oil trades in Chinese yuan. And Iran’s missile and drone capabilities demonstrated in the 2019 Abqaiq attack on Saudi processing facilities and in recent regional exchanges have grown far faster than the Gulf Arab states’ ability to defend against them.

The question for the 2030s is not whether the Strait of Hormuz will remain the most important 21 miles of water on Earth. It will. The question is whether the United States will still be the country guarding it and whether the dollar’s position as the global oil currency will survive the answer.

That is the trillion-dollar question that almost nobody in the headlines is asking.

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## Sources

US Energy Information Administration, “The Strait of Hormuz is the world’s most important oil transit chokepoint,” EIA Today in Energy. https://www.eia.gov/todayinenergy/detail.php?id=55881

International Maritime Organization, Traffic Separation Scheme for the Strait of Hormuz. https://www.imo.org/

Reuters, “Explainer: Middle East oil bypass pipelines and their capacity.” https://www.reuters.com/business/energy/

International Institute for Strategic Studies (IISS), *The Military Balance 2024* -chapter on Iran. https://www.iiss.org/publications/the-military-balance/

International Energy Agency, “Oil market scenarios under Strait of Hormuz disruption.” https://www.iea.org/reports/

Securing America’s Future Energy, “The Military Cost of Defending the Global Oil Supply” (2018, updated 2023). https://secureenergy.org/

Spiro, David E. *The Hidden Hand of American Hegemony: Petrodollar Recycling and International Markets.* Cornell University Press, 1999.

International Energy Agency, “Oil 2024: Analysis and forecast to 2030” - Asia-Pacific import flows. https://www.iea.org/reports/oil-2024

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## Further down the rabbit hole

- **Book:** Daniel Yergin, *The Prize: The Epic Quest for Oil, Money, and Power.* The definitive history of how oil shaped the 20th century - required reading for understanding why the Gulf matters.
- **Book:** Michael Klare, *Blood and Oil.* A darker but well-sourced account of how US foreign policy has oriented itself around Gulf petroleum.
- **Paper:** Eugene Gholz, “Assessing the ‘Threat’ to International Oil Supplies,” Cato Institute, 2018 - argues the $50 billion figure may overstate the real security benefit.


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