Strait of Hormuz Explained: Oil Flows, Control and the 2026 Crisis

The Strait of Hormuz is the only sea exit from the Persian Gulf, and in 2026 it became the central pressure point of the U.S.–Iran war. This guide explains the waterway itself, what moves through it, how the crisis developed, where the two sides’ accounts of shipping differ, and which Peter’s World reports cover each part. It is an evergreen explainer, and we update the timeline and tables as new reporting arrives. For the day-to-day story, see our Iran, IRGC and Strait of Hormuz news hub.

Background on the people and civilization of Iran: Persian Culture: History, People and Common Myths.

What the Strait of Hormuz is

The strait separates Iran from the Arabian Peninsula, with Oman on the southern shore, and links the Persian Gulf to the Gulf of Oman and the Arabian Sea. The U.S. Energy Information Administration (EIA) describes it as deep and wide enough for the world’s largest crude tankers. The International Energy Agency (IEA) says the navigable channels are two miles wide in each direction, separated by a two-mile buffer zone. The IEA’s website gives the narrowest point as 21 nautical miles, while its 2026 factsheet says 29, so the exact figure depends on where and how the width is measured. Either way, ship traffic is squeezed into two narrow lanes that sit close to Iranian and Omani waters.

That geography explains why a small naval force can threaten a very large flow of trade. A mine, a missile or even a credible warning can make insurers and ship owners hold vessels back without any ship being sunk.

What moves through it

According to the IEA, about 20 million barrels a day of crude oil and oil products passed through the strait in 2025. That is around a quarter of the world’s seaborne oil trade, and roughly 80% of it went to Asian buyers. The EIA’s tanker-tracking data show Saudi Arabia is the largest user: its crude and condensate made up 38% of Hormuz crude flows in 2024. China, India, Japan and South Korea together took 69% of the crude and condensate.

Natural gas is even more exposed. The IEA estimates that 93% of Qatar’s and 96% of the United Arab Emirates’ liquefied natural gas exports leave through the strait, together about 19% of global LNG trade, and it notes there is no alternative route for those cargoes.

Some crude can bypass the strait. The IEA counts 3.5 to 5.5 million barrels a day of spare pipeline capacity, mainly Saudi Arabia’s East-West pipeline to the Red Sea port of Yanbu and the UAE’s pipeline to Fujairah on the Gulf of Oman. The EIA adds that Iran’s own Goreh-Jask pipeline has an effective capacity near 300,000 barrels a day but was barely used in 2024. The bypass option is itself exposed to the second chokepoint in this story, the Red Sea. As we reported, Saudi Arabia restarted its East-West pipeline to Yanbu after a drone shutdown, and Houthi gains along Yemen’s coast raise the risk to the Red Sea route, as covered in our report on the Houthi grip on Bab el-Mandeb.

Timeline: how the 2026 crisis developed

The timeline below is compiled from several Peter’s World reports and the outlets they cite. Claims by Iranian or U.S. officials are labeled as claims.

Date (2026)DevelopmentReported by
Feb 28The United States and Israel launch strikes on Iran; Iran then tightly restricts Hormuz traffic.Peter’s World Iran hub; tanker report
AprilPresident Donald Trump announces a U.S. blockade of the strait.Peter’s World
JuneThe Islamabad memorandum briefly eases fighting; it calls for a phased end to the blockade and safe passage, but implementation stalls.Peter’s World Iran hub, citing Anadolu
Sep 14CENTCOM says U.S. forces have redirected 101 ships under the blockade.Peter’s World Iran hub
Sep 22Iran says it can reopen the strait within seven days if the U.S. eases pressure.Peter’s World
Sep 27–30UN Ambassador Mike Waltz says Washington rejected the plan over up-front sanctions relief; Iran says it received a U.S. reply on Sep 30, with the order of steps the main dispute.Waltz report; sequencing report
Oct 2An unidentified projectile hits a tanker and starts a fire; UKMTO reports the crew safe.Peter’s World, citing UKMTO
Oct 6–7Oman rescues 10 crew from the burning tanker On Peace; 12 crew on a Panama-flagged tanker are injured by a projectile. An IRGC adviser says the strait is closed and CENTCOM calls that false. Iran and Oman say they agreed coordinates for safe routes.Attacks report; safe-routes report

Two accounts of how much is moving

The most contested question is how much traffic is actually crossing. The table puts the competing figures side by side. We have not reconciled them, because they measure different things: ship counts, crude exports from the whole region, and flows from Gulf producers excluding Iran.

SourceFigureWhat it measures
IRGC adviser Majid Mirahmadi (claim, via Iran International)About 10 ships a day, against 125 before the warShips crossing the strait
Kpler (via Iran International)Five commodity vessels on Oct 3, none the next dayCommodity vessels crossing the strait
Kpler (via Reuters)18.3 million barrels a day, seven-day average to Sep 30Regional crude exports, including the Red Sea and Gulf of Oman
Kpler (via Al Jazeera)More than 81% of pre-war levels in SeptemberGulf oil flows excluding Iran
CENTCOM (statement on X, Oct 7)20 million barrels of crude flowing “right now”Oil in transit through the strait
Iran InternationalIranian exports at zero in SeptemberIran’s own seaborne oil under the U.S. blockade

Read together, the numbers suggest oil from other Gulf producers is moving at close to pre-war volumes while the number of ships crossing is far lower and more irregular. Most tankers now use a corridor near Oman’s coast, often with tracking signals switched off and under U.S. military protection, according to Bloomberg and CNBC as cited in our reporting.

The cost of crossing

Risk, rather than closure, is what drives the price. Baltic Exchange data cited by Bloomberg showed the rate for carrying oil from the Persian Gulf to China reaching a record $1.3 million a day on Oct 5, against an average near $60,000 a day last year. UKMTO had logged nine attacks in the waterway in the first week of October, roughly half its September total for the Strait of Hormuz and the Persian Gulf combined, and Bloomberg attributed the recent attacks to Iran. Brent crude traded at $101.23 a barrel on Oct 7. LNG has recovered more slowly than oil because it travels on a smaller fleet of specialized carriers.

Analysis: why the strait matters more than the ship count

This section is Peter’s World analysis based on the sources cited on this page. Forecasts are judgments, not facts.

The strait works as leverage because the lanes are narrow and the substitutes are limited. Pipelines can carry at most a fraction of what tankers carry, and LNG has no bypass at all, so a long disruption would fall hardest on Asian importers and on Qatar and the UAE as exporters. That is why both governments describe control of the waterway as a political prize. Iran’s stated position, in the words of the IRGC adviser quoted above, is that the strait stays closed until its demands are met. Washington’s position, in CENTCOM’s words, is that the United States and its partners control it.

The data support a narrower conclusion than either claim. Oil is still reaching market, but the system depends on a protected corridor, on ships that hide their positions, and on freight and insurance prices that already reflect the danger. As one risk-firm executive put it in the reporting we cited, Iran does not need to stop every vessel; it needs shippers to believe any vessel could be next. In our judgment, the most useful indicators to watch are the number of commodity vessels crossing each day, attack counts from UKMTO, and whether Iran acts on its warning about the routes along Oman’s coast. A move against those routes would test the claim that U.S. and partner forces control the strait. Meanwhile the Red Sea route, which carries the bypass pipeline’s exports, is under separate pressure from the Houthis, so the two chokepoints now have to be read together.

Frequently asked questions

Is the Strait of Hormuz closed? Not in the sense of zero traffic. An IRGC adviser said on Oct 7 that it is closed, and CENTCOM answered that traffic is flowing. Ship counts are far below pre-war levels, but regional oil exports have largely recovered, according to Kpler data.

Who is the IRGC and why does it matter here? The IRGC’s naval branch patrols Iran’s waters, including the strait. Read our explainer, IRGC Explained, for its structure and role.

Can oil avoid the strait? Partly. Pipelines to Yanbu and Fujairah can move some crude, but they cannot carry the whole flow, and LNG has no alternative.

All Peter’s World coverage

Every indexed report we have published on this topic, grouped by subtopic and listed newest first.

Sanctions, Congress and war powers

Houthis, Red Sea and Saudi Arabia

Diplomacy, nuclear file and the UN

Strait of Hormuz and shipping

Military operations and weapons

Other Iran coverage

Sources

Additional sources

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