Twenty million barrels, one passage
Published 2 October 2026
The map narrows faster than the demand does.
At its narrowest, the Strait of Hormuz is about fifty-four kilometres wide. Its navigation system includes two-mile-wide channels for inbound and outbound traffic with a buffer between them. The IEA's factsheet, updated in February 2026, puts 2025 oil flows at about twenty million barrels a day, roughly a quarter of world seaborne oil trade. Those are a pre-war annual baseline, not a measurement of today's traffic. IEA baseline factsheet.
The same table separates 14.95 million barrels a day of crude and condensates from 4.93 million of products, for a total of 19.87 million. That separation is essential. A later story about crude exports cannot be compared directly with a baseline that includes diesel, petrol and other products. Source record.
Saudi Arabia accounted for 6.23 million barrels a day of those total Hormuz oil flows in 2025. Iraq contributed 3.63 million, the UAE 3.24 million, Iran 2.41 million and Kuwait 2.37 million. Qatar, Bahrain and the Saudi-Kuwaiti Neutral Zone supplied the remaining listed flows. These figures describe exports through a particular route. They are not the total production of each country. Source record.
About eighty percent of the oil passing through Hormuz was destined for Asia. China and India together received forty-four percent of the crude and condensate exports transiting the strait. Japan and Korea were particularly dependent among IEA countries. This is why a maritime confrontation in the Gulf becomes an Asian industrial problem even before a household sees a price increase.
Different exporters have different escape routes. The UAE's Abu Dhabi crude pipeline connects Habshan to Fujairah, outside the strait. The IEA describes a reported current capacity near 1.8 million barrels a day, with roughly 1.1 million already used and up to 0.7 million of additional room. Saudi Arabia's East-West system connects Abqaiq to Yanbu on the Red Sea. The factsheet records Aramco's report of capacity increased to seven million barrels a day, but warns that sustained operation at that level was not tested. Source record.
The IEA's practical estimate of available bypass capacity was 3.5-5.5 million barrels a day. That is materially less than the baseline total passing through Hormuz, and it is for crude, not a universal replacement route for every product and gas cargo. A nominal pipeline number cannot simply be subtracted from a strait's total without checking what the line carries and where it ends. Source record.
Iran's Goreh-Jask pipeline illustrates the difference between an announced alternative and a proven operating alternative. The factsheet records reported capacity of one million barrels a day, but says the line and port remained effectively non-operational as an export option after a test loading in late 2024. A line drawn on a map can be strategically promising without yet being a reliable route. Source record.
Moving crude to the Red Sea also changes the route rather than abolishing maritime risk. Ships still need ports, insurance and access to the destination. The September 2026 IEA report describes continuing attacks and constraints around both the Gulf and Bab el-Mandeb. A bypass is a valuable option, not a guarantee that geography has been defeated. IEA September report.
The strait is shared by interests that are not identical. Iran can seek leverage through disruption but also needs export revenue. Gulf producers need access to customers. Importers need reliable deliveries. Naval powers care about freedom of movement and their alliances. Shipowners need an acceptable risk-adjusted voyage. The cargo is where these preferences collide.
The insurer is part of the route
A route can remain physically navigable while its commercial terms change sharply. The International Group of P&I Clubs' 2026 update distinguishes mutual owned cover from non-mutual covers and primary war cover. It says the group excess-war P&I arrangement had not been amended by the Iran attacks, while primary-war insurers had issued notices affecting listed areas and voyage rates. That does not support a blanket claim that all shipping insurance disappeared. International Group insurance update.
A UK P&I Club circular dated 2 March 2026 gives an even narrower example. It issued seventy-two-hour cancellation notice for war-risk coverage on specified non-mutual business, effective 3 March. It explicitly says the notice did not apply to mutual P&I entries, including specified group war covers, and says write-back cover was available subject to conditions. A cancellation notice can therefore mean repricing or renegotiation of a category of cover, not the disappearance of every protection on every ship. Original club circular.
Hull damage, third-party liabilities, cargo and crew-related exposures are not identical policies. The relevant contract and exclusions have to be checked. The general economic point is that a voyage can become more expensive, conditional or unattractive without a physical barrier permanently closing the channel.
That is the missing link in many oil headlines. A military development changes perceived risk. Risk changes the price or availability of cover. Cover affects the owner's decision and financing terms. The decision changes which cargoes move and when. The resulting scarcity can raise product prices before a refinery itself is damaged.
UNCTAD's February 2024 assessment of the Red Sea, Black Sea and Panama Canal shows that multiple route problems can overlap. It reported canal transits down sharply against earlier peaks and described higher freight, rerouting and insurance pressure. Its figures belong to that historical episode, not the current Hormuz market. The mechanism survives: a detour uses more voyage time and fleet capacity for the same delivered cargo. UNCTAD shipping assessment.
If a round trip takes longer, the same tanker fleet carries fewer cargoes per month. Even without a tanker sinking, effective transport capacity can fall. That turns geography into a freight-rate problem and explains why shipping can stay costly after a crude-export recovery begins.
The next chapter measures what happened to those flows in 2026. It refuses the easy sentence that the strait is either open or closed, because the cargoes do not obey that binary as neatly as the headline does.
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