By Vanderbiltreport Team · Evergreen explainer · Last reviewed September 26, 2026
The Strait of Hormuz is a narrow waterway between Iran and Oman, and it is the most important oil shipping route in the world. In a normal year, about one-fifth of all the oil the world uses passes through it. When traffic there slows or stops, gasoline prices, shipping costs, and stock markets feel it within days. This explainer covers what the Strait of Hormuz is, why it matters so much, what happens when it is disrupted, and the questions readers ask most often.
Where Is the Strait of Hormuz?
The strait connects the Persian Gulf to the Gulf of Oman and, from there, to the Arabian Sea and the Indian Ocean. Iran sits on its northern shore. Oman’s Musandam Peninsula forms the southern shore, with the United Arab Emirates close by.
- Width: About 21 nautical miles (39 km) at its narrowest point, according to the International Energy Agency (IEA).
- Shipping lanes: The usable deep-water channels are far narrower than the strait itself, so large tankers travel in tight inbound and outbound lanes.
- Who depends on it: Saudi Arabia, Iraq, the UAE, Iran, Kuwait, Qatar, and Bahrain all ship most of their oil or gas exports through it.
For countries such as Kuwait, Qatar, and Bahrain, there is no other sea route to world markets.
Why the Strait of Hormuz Matters: The Numbers
The U.S. Energy Information Administration (EIA) calls Hormuz the world’s most important oil transit chokepoint. The table below shows figures from the EIA and IEA for normal, pre-2026 conditions.
| Measure | Figure | Source |
|---|---|---|
| Oil flow (crude and products) | About 20 million barrels per day (2024 and 2025) | EIA, IEA |
| Share of global oil consumption | About 20% | EIA |
| Share of global seaborne oil trade | More than one-quarter | EIA, IEA |
| Share of global LNG trade | About one-fifth, mostly from Qatar | EIA, IEA |
| Crude going to Asia | 84% (2024) | EIA |
| China, India, Japan and South Korea combined | 69% of Hormuz crude flows (2024) | EIA |
| U.S. crude imports via Hormuz | About 0.5 million b/d, 7% of U.S. crude imports (2024) | EIA |
Sources: EIA, “Amid regional conflict, the Strait of Hormuz remains critical oil chokepoint” (June 2025); IEA, Strait of Hormuz.
Which countries ship through it?
According to the IEA, the largest crude exporters that depend on the strait are Saudi Arabia (about 5.4 million b/d), Iraq (3.3 million), the UAE (2.0 million), Iran (1.7 million), Kuwait (1.4 million), and Qatar (0.7 million). Qatar is also one of the world’s largest exporters of liquefied natural gas (LNG), and almost all of it leaves through Hormuz.
Can Oil Go Around the Strait?
Only partly. Two pipeline systems can move some Gulf oil to ports outside the strait:
- Saudi Arabia’s East-West pipeline (Petroline) runs across the kingdom to the Red Sea port of Yanbu.
- The UAE’s Abu Dhabi Crude Oil Pipeline (ADCOP) carries crude to Fujairah on the Gulf of Oman.
Estimates of how much spare capacity these routes have vary. The EIA put it at about 2.6 million b/d. The IEA estimates 3.5 to 5.5 million b/d. Either way, that is a fraction of the roughly 20 million b/d that normally moves through the strait. Iraq, Kuwait, Qatar, and Bahrain have no comparable bypass, and LNG cannot use oil pipelines at all.
What Happens When the Strait of Hormuz Is Disrupted?
Because there is so little spare route capacity, even the threat of disruption moves markets. The effects usually show up in this order:
- Insurance and freight costs rise. War-risk insurance premiums for tankers go up, and some shipowners stop sending vessels.
- Oil and gas prices jump. Traders price in the chance of lost supply. Brent crude, the global benchmark, is the first to react.
- Consumers feel it. Higher crude prices pass through to gasoline, diesel, jet fuel, and eventually shipping and food costs.
- Governments respond. IEA member countries hold emergency oil stocks, and they can release them together to calm markets.
- Asia is hit hardest. Most Hormuz oil and LNG goes to Asian buyers, so China, India, Japan, and South Korea are the most exposed.
A Short History of Tension in the Strait
- 1980s “Tanker War”: During the Iran-Iraq War, both sides attacked merchant shipping in the Gulf. In 1987–88 the U.S. Navy escorted reflagged Kuwaiti tankers in Operation Earnest Will.
- Repeated threats: Iranian officials have threatened to close the strait several times during disputes with the United States and its allies.
- 2026 crisis (developing): After U.S. and Israeli strikes on Iran in early 2026, commercial traffic through the strait was severely disrupted and oil prices rose above $100 a barrel. Conditions have changed repeatedly since then. See our coverage below for the latest verified developments.
Who Controls the Strait of Hormuz?
No single country controls it. The strait’s shipping lanes pass through the territorial waters of Iran and Oman, because the strait is too narrow for a strip of open international waters. Under the UN Convention on the Law of the Sea (UNCLOS), ships of all nations have a right of “transit passage” through straits used for international navigation, and coastal states may not suspend it. Iran signed UNCLOS but has not ratified it, and it has argued that transit passage applies only to countries that are parties to the treaty. The United States, which is also not a party, treats transit passage as customary international law. This legal disagreement is one reason tensions in the strait can escalate quickly.
Strait of Hormuz FAQ
How much oil goes through the Strait of Hormuz?
About 20 million barrels per day in 2024 and 2025, or roughly 20% of global oil consumption (EIA, IEA).
Why can’t tankers just take another route?
The Persian Gulf has only one sea exit. Pipelines in Saudi Arabia and the UAE can reroute some crude, but only a fraction of normal volumes.
Does the U.S. get much oil through Hormuz?
Relatively little. In 2024, about 7% of U.S. crude imports came through the strait. But oil is priced globally, so a disruption still raises U.S. fuel prices.
Is the strait important for natural gas too?
Yes. About one-fifth of global LNG trade passes through it, mostly from Qatar, and most of it goes to Asia.
Which countries are most affected by a closure?
The Gulf exporters that rely on the strait, plus the big Asian importers: China, India, Japan, and South Korea.
Key Takeaways
- The Strait of Hormuz is about 21 nautical miles wide at its narrowest and is the world’s most important oil chokepoint.
- About one-fifth of global oil consumption and LNG trade normally passes through it.
- Bypass pipelines can carry only a fraction of normal flows.
- Disruptions raise insurance, freight, and fuel costs worldwide, with Asia most exposed.
Related Coverage on Vanderbiltreport.com
- Iran War Nears a Turning Point as Trump Claims Direct Talks and Oil Holds Above $100
- Strait of Hormuz Oil Shock Rattles US Markets
- Strait of Hormuz Deal: What the Breakthrough Means for Americans
- Energy News: Oil Slides as the Strait of Hormuz Prepares to Reopen
- Middle East Ceasefire Talks: A Friendly Guide to the Global Headlines
Sources
- U.S. Energy Information Administration: Amid regional conflict, the Strait of Hormuz remains critical oil chokepoint (June 16, 2025)
- International Energy Agency: Strait of Hormuz
- EIA: World Oil Transit Chokepoints
- United Nations: Convention on the Law of the Sea (Part III, Straits Used for International Navigation)
Figures describe normal, pre-2026 conditions unless noted. Current shipping conditions are developing; check our latest news coverage for updates.
Publisher Disclaimer: Vanderbiltreport.com publishes news and information for general informational and educational purposes. Information is compiled from sources believed to be reliable, but Vanderbiltreport.com does not guarantee the accuracy, completeness, or timeliness of all information presented. Readers should independently verify information and conduct their own research before making financial, investment, business, or other decisions.
