Event guide · Maritime chokepoint

Strait of Hormuz

About a fifth of the world's oil moves through a channel 21 nautical miles wide at its narrowest point. No other single stretch of water matters more to energy markets — which is why "is the Strait of Hormuz open?" spikes on search engines every time the region makes news.

Current status

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This guide is maintained editorially. Last updated 8 August 2026.

Is the Strait of Hormuz open right now?

Almost always, yes — the strait has never been fully closed to commercial shipping, including during the 1980s "Tanker War", the 2019 tanker attacks and seizures, and every escalation since. What actually happens during a crisis is disruption short of closure: war-risk insurance premiums jump, some owners route around or pause transits, transit times stretch, and freight rates for the remaining capacity rise. For markets, disruption — not the binary open/closed question — is the thing worth measuring, which is why Farlens scores it on a continuous scale rather than as a yes/no.

What the strait is

The Strait of Hormuz is the passage between the Persian Gulf and the Gulf of Oman — the only sea route out of the Persian Gulf. Iran sits on its northern shore; the southern shore belongs to Oman's Musandam exclave, with the UAE just behind it. At its narrowest the strait is about 21 nautical miles (roughly 39 km) wide, and the actual shipping channels are far tighter: inbound and outbound lanes each about two miles wide, separated by a two-mile buffer.

~20M

barrels of oil per day in recent years — roughly a fifth of global consumption

~1/5

of globally traded LNG, almost all of it from Qatar

21 nm

wide at the narrowest point; shipping lanes ~2 miles each way

Why it matters to markets

Most oil leaving Saudi Arabia, Iraq, Kuwait, the UAE, Qatar, and Iran transits Hormuz, and the alternatives are thin: Saudi Arabia's East–West pipeline and the UAE's Fujairah pipeline can together bypass only a fraction of daily flow. That asymmetry — enormous volume, minimal rerouting capacity — is why even rumours of disruption move crude prices, tanker rates, and the equities exposed to both.

Which sectors feel a disruption — both sides

Where pressure can help

Producers outside the Gulf gain relative share while flows are constrained. Tanker owners with vessels outside the affected zone historically benefit from rate spikes. Refiners with diversified crude sourcing see competitors squeezed harder than themselves.

Where pressure hurts

Airlines and shippers face jet-fuel and bunker-cost pressure. Importing economies' refiners pay up for replacement barrels. Gulf-listed equities carry direct regional risk premia. Insurers absorb war-risk exposure repricing.

Sector patterns describe historical tendencies, not predictions or recommendations. Any given episode can and does break the pattern.

Can it actually be closed?

A sustained full closure is widely considered unlikely even in conflict, for a practical reason: the states most dependent on the strait include the ones most often assumed to threaten it. Iran's own exports move through Hormuz. Mining or blockading it invites a naval response and cuts off the blockader's revenue — which is why historical episodes have produced harassment, seizures, and attacks on individual vessels rather than closure. The market-relevant scenario is persistent elevated risk, not a shut gate.

Is the strait international waters?

Strictly, no — the strait is narrow enough that it lies within the territorial waters of Iran and Oman. Commercial passage is protected instead by the transit passage regime under the UN Convention on the Law of the Sea, which both littoral states have historically honoured in practice. The legal nuance matters during escalations, when the gap between "protected passage" and "contested waters" is exactly where risk premia live.

A short history of Hormuz disruptions

1984–1988 ("Tanker War") — hundreds of vessels attacked during the Iran–Iraq war; shipping continued throughout, under escort in the later years.
2019 — tanker sabotage and seizures alongside Gulf tensions; war-risk premiums for Gulf transits rose sharply within weeks.
2020s — recurring seizure incidents and drone/limpet episodes, each producing days-to-weeks of elevated insurance and freight pricing without closure.

The recurring shape — sharp risk repricing, no closure, gradual normalisation — is exactly the kind of pattern Farlens quantifies with historical analogues: how many times a disruption score crossed a threshold, and the distribution of what followed. See methodology for how those analogues are computed and graded.