The Strait of Hormuz is the most important piece of geography in the global energy system. A narrow stretch of water between Iran and the Arabian Peninsula — just 21 miles wide at its narrowest point — it is the only sea passage from the oil-rich Persian Gulf to the open ocean. Roughly 20 million barrels of oil and oil products pass through the strait every day, representing 25% of all globally traded seaborne oil and about a fifth of total world oil consumption. Around 20% of the world’s liquefied natural gas (LNG) transits the same channel, mostly Qatari exports bound for Asia and Europe.
When markets talk about “Hormuz risk,” this is what they mean. There is no other waterway in the world where so much energy moves through so narrow a corridor. There is no land route around it that comes close to replacing its capacity. And there is no realistic path for global oil markets to absorb a sustained closure without triggering the largest price shock in modern history. This guide explains what the Strait of Hormuz is, why it matters, who depends on it, and what would actually happen if it closed.
The Geography
The Strait of Hormuz connects the Persian Gulf to the Gulf of Oman and from there to the Arabian Sea and the Indian Ocean beyond. It is bordered to the north by Iran — specifically the Iranian provinces of Hormozgān and Bandar Abbas — and to the south by the Musandam Peninsula, an exclave of Oman, with a small portion controlled by the United Arab Emirates. The strait is approximately 104 miles long. At its narrowest point it measures 21 miles across; at its widest it reaches roughly 60 miles.
The depth profile makes the entire strait technically navigable for the largest crude carriers (VLCCs and ULCCs), but international shipping is concentrated in a designated Traffic Separation Scheme. Established by the International Maritime Organization in 1973 and revised in 1979, the TSS is one of the oldest such schemes in the world. It consists of two 2-mile-wide lanes — one for inbound traffic, one for outbound — separated by a 2-mile median buffer. Both lanes lie in Omani territorial waters. Iran has historically not ratified the U.N. Convention on the Law of the Sea but generally permits transit through the parts of the strait within its territorial sea under the customary “innocent passage” doctrine.
Despite the strait’s technical width, the practical bottleneck is much tighter. The combined navigable shipping corridor — two 2-mile lanes plus a 2-mile median — is only six miles wide. A single mining incident, a single damaged or burning vessel, or a single missile strike on a tanker could halt traffic in one direction within hours. That fragility is why analysts treat the strait not just as a geographic feature but as an active live wire in global energy markets.
Why It Matters: The Oil Flow
According to the International Energy Agency, an average of approximately 20 million barrels per day of crude oil and refined oil products moved through the Strait of Hormuz in 2025. That equates to about 25% of all seaborne oil trade and roughly 20% of total world oil consumption. The U.S. Energy Information Administration tracks similar figures and consistently identifies the strait as the world’s most important oil transit chokepoint.
The composition of those flows is heavily weighted toward Asia. The IEA reports that nearly 15 million barrels per day of crude oil — about 34% of global crude trade — transited the strait in 2025, with the bulk destined for Asian markets. China and India alone received 44% of those exports. Japan and South Korea, two highly oil-import-dependent economies, are also major buyers. Europe takes a smaller but still meaningful share. The United States imports relatively little Persian Gulf crude directly — in recent years roughly 7% of U.S. consumption originated from the strait — but U.S. oil prices are set on global benchmarks, and a price shock at Hormuz hits American consumers and refiners through the global pricing channel regardless of physical sourcing.
Where Hormuz Oil Goes
Approximate share of crude leaving the strait by destination region, 2025. Source: IEA.
The LNG dimension is just as important and less often discussed. Roughly 20% of global LNG trade moves through Hormuz, the great majority of it Qatari output bound for Asian and European buyers. Qatar produces roughly 80 million tons of LNG annually, and essentially all of it has historically transited the strait. Disruptions there cascade into European gas prices (Dutch TTF) and Asian benchmarks (the Japan-Korea Marker, or JKM) within days.
Which Countries Depend on the Strait?
Seven Persian Gulf states ship oil through Hormuz: Saudi Arabia, the UAE, Kuwait, Qatar, Iraq, Bahrain, and Iran itself. The critical distinction among them is which ones have a meaningful pipeline bypass and which do not.
Bypass capacity vs. dependence
Has bypass:
- Saudi Arabia — The Petroline (East-West Pipeline) crosses 745 miles from the Abqaiq fields to the Red Sea port of Yanbu. Nameplate capacity is roughly 5 million barrels per day, with available headroom of around 2–3 million bpd above current normal flows.
- United Arab Emirates — The Abu Dhabi Crude Oil Pipeline (ADCOP, also called Habshan-Fujairah) runs 250 miles from inland fields to the port of Fujairah on the Gulf of Oman, fully bypassing the strait. Capacity is approximately 1.5–1.8 million bpd, with 700,000 bpd or so of available headroom.
No meaningful bypass:
- Kuwait — All crude exports route through the strait. No operational pipeline alternative.
- Qatar — All LNG exports route through the strait. The vast majority of Qatari oil and condensate as well.
- Bahrain — Limited production, all routed through the strait.
- Iraq — The bulk of Iraqi exports flow through Basrah ports in the Persian Gulf, requiring transit via Hormuz. The Iraq-Turkey pipeline to Ceyhan is a partial alternative but has been intermittent.
- Iran — Most Iranian exports route through Kharg Island and other Persian Gulf terminals. The Goreh-Jask pipeline to the Sea of Oman, designed as a Hormuz bypass, has had limited operational use.
The combined available pipeline bypass capacity from Saudi Arabia and the UAE is roughly 3.5–5.5 million barrels per day according to IEA estimates. Against the 15 million barrels per day of crude that normally transit the strait, that is meaningful but far from sufficient. A full Hormuz closure would still strand the majority of Persian Gulf oil exports until alternative logistics could be improvised — and the IEA notes that those alternative logistics “have not been robustly tested” at the volumes a closure scenario would require.
The Bypass Gap
Daily crude transit through Hormuz vs. available pipeline bypass capacity. Million barrels per day.
How Hormuz Compares to Other Oil Chokepoints
The Strait of Hormuz is not the only chokepoint that matters in global oil flows — the Strait of Malacca, the Suez Canal / SUMED Pipeline complex, the Bab el-Mandeb in the southern Red Sea, the Turkish Straits, and the Cape of Good Hope all carry meaningful volumes. But none of them carries volumes anywhere close to Hormuz, and none of them is as supply-concentrated. The Malacca strait moves more total barrels but draws from a much wider set of sources; closing Malacca redirects flows, while closing Hormuz strands them.
Global Oil Chokepoints Compared
Approximate daily oil transit, million barrels per day. Source: U.S. EIA, IEA.
What Happens If the Strait Closes
The price impact of a sustained Hormuz closure would be unprecedented. Different analysts have produced different scenarios depending on assumptions about duration and severity, but the rough consensus is clear: a closure lasting more than a few days would push Brent crude above $150 per barrel; a closure lasting weeks would put $200–$250 per barrel within the range of plausible outcomes. The 2022 Russia shock pushed Brent briefly above $130. A Hormuz closure would dwarf that.
The asymmetry is what makes the scenario so severe. A Hormuz disruption would not only physically remove millions of barrels per day from the world market — it would simultaneously trap most of the world’s spare production capacity, which sits in Saudi Arabia and is reachable only via the East-West Pipeline. Saudi Arabia’s spare capacity has run roughly 3–4 million bpd in recent quarters; in a Hormuz crisis, only the fraction reachable through Yanbu would be effectively available to global markets. The IEA has warned explicitly that “the vast majority of the world’s spare crude oil production capacity could be made unavailable as well” during a sustained disruption.
The physical-shortage dimension would be most acute in Asia. Japan and South Korea source the majority of their oil from the Persian Gulf and have limited strategic reserves relative to consumption. India and China have larger reserves and more diverse import portfolios but would still face immediate pressure. The U.S. would feel the price shock primarily through gasoline and diesel; its physical supply is more diversified, but elevated crude pricing would push retail gas prices well above current levels. U.S. retail gas prices have historically responded to crude moves with a 1–3 week lag, with a typical pass-through of roughly 2.5 cents per gallon for every $1 increase in WTI.
History as a Chokepoint
The Strait of Hormuz has been a strategic asset for as long as Persian Gulf oil has mattered to the world. The most direct historical precedent for a modern crisis is the Tanker War (1984–1988), the maritime phase of the Iran-Iraq War. During that period roughly 451 commercial vessels were attacked in or near the strait. Iraq, attempting to cut off Iran’s oil revenue, struck Iranian shipping; Iran retaliated against tankers carrying Kuwaiti and Saudi crude that funded Iraq’s war effort. The U.S. responded with Operation Earnest Will, escorting reflagged Kuwaiti tankers under American protection, and with Operation Praying Mantis in April 1988 — the largest U.S. naval engagement since World War II, a one-day strike on Iranian targets in retaliation for the mining of the USS Samuel B. Roberts. Through it all, the strait never fully closed. Tanker traffic continued, though insurance costs spiked and routing changed materially.
More recent episodes have followed a familiar pattern: Iranian harassment of commercial shipping, U.S. and allied naval response, brief market panics, eventual de-escalation. In May and June 2019, four tankers were attacked off the UAE coast, then two more in the Gulf of Oman; the U.S. and allies attributed the attacks to Iran. In 2024 Houthi attacks in the Red Sea diverted Suez-bound traffic around the Cape of Good Hope, and as the regional conflict intensified, the Hormuz risk premium returned to oil markets in earnest. The current crisis — the dual U.S. naval blockade and Iranian counter-blockade that began in 2026 — is the most severe disruption to the strait’s function in the modern era.
Hormuz Incident Timeline
Selected major disruptions to traffic in or near the strait, 1984–2026.
Could Iran Actually Close It?
Iran possesses the military tools to disrupt traffic in the Strait of Hormuz. Its capabilities include an estimated naval mine inventory of several thousand units, anti-ship cruise missiles (the Noor and Khalij Fars systems among them), Islamic Revolutionary Guard Corps (IRGC) navy fast attack craft optimized for swarm tactics, and a small fleet of submarines including Russian Kilo-class boats and domestic Ghadir-class midget subs. From shore, Iran fields layered air defense and coastal missile batteries.
The consensus assessment among Western military analysts is that Iran could disrupt traffic in the strait substantially — for days or weeks — but cannot close it indefinitely against U.S. and allied countermeasures. A closure scenario would likely involve some combination of naval mining (highly effective short-term, slow to defeat), missile and small-craft harassment, and threats to retaliate against vessels transiting under U.S. escort. U.S. and allied counter-mining operations would take time but are well-rehearsed; the U.S. Fifth Fleet, headquartered in Bahrain, exists in significant part for this scenario.
The strategic point is that Iran’s leverage in the strait has historically been more effective as a threat than as an executed closure. The credible possibility of disruption embeds a risk premium in oil prices regardless of what Iran actually does. That risk premium is real money, both for Iran (which sells some of its own oil at the elevated price) and for global consumers. Whether the threat ever escalates to actual sustained closure depends less on capability and more on Iranian political calculus — the cost-benefit math of cutting off the country’s own oil exports and inviting major power retaliation.
Current Status
For the current state of the strait — ongoing transit volumes, U.S. and Iranian naval posture, diplomatic developments, and price reactions — see our continuously updated geopolitics dashboard. Live oil benchmarks reflecting Hormuz-related risk pricing are available on the oil prices dashboard. For pump-level effects of the current Persian Gulf disruption, see U.S. gas prices by state.
Frequently Asked Questions
How wide is the Strait of Hormuz?
At its narrowest point, the Strait of Hormuz is roughly 21 miles (34 km) wide. The actual navigable shipping corridor is much narrower — two 2-mile-wide traffic lanes (one inbound, one outbound) separated by a 2-mile buffer, totaling 6 miles of usable transit width. The strait runs about 104 miles long total.
How much oil passes through the Strait of Hormuz?
Approximately 20 million barrels per day of crude oil and oil products passed through the Strait of Hormuz in 2025, according to the International Energy Agency — roughly 25% of global seaborne oil trade and 20% of total world oil consumption. Around 20% of global LNG also transits the strait, primarily Qatari exports.
Which countries depend on the Strait of Hormuz?
Saudi Arabia, the UAE, Kuwait, Qatar, Iraq, Bahrain, and Iran all export oil through the strait. Of these, only Saudi Arabia and the UAE have functional pipeline bypasses. Kuwait, Qatar, Bahrain, and Iraq have no meaningful alternative export routes.
What happens if the Strait of Hormuz closes?
A complete or sustained closure would create the largest supply disruption in oil-market history. Global oil prices would spike — analysts have variously estimated $150–$250 per barrel under sustained closure. Most of the world’s spare oil production capacity (held by Saudi Arabia) would also be effectively trapped behind the disruption. Asian buyers would be the most affected.
Has the Strait of Hormuz ever been closed?
The strait has never been completely closed in modern times, but it has been heavily disrupted — most notably during the 1984–1988 Tanker War, when roughly 451 commercial vessels were attacked. Tanker traffic continued throughout, but insurance costs spiked and routing changed.
Can Iran actually close the Strait of Hormuz?
Iran has the military capability to disrupt traffic substantially, but most analysts assess that Iran cannot close the strait indefinitely against U.S. and allied countermeasures. A partial disruption could last weeks before counter-mining and naval operations restored transit. The threat of closure has historically been more effective as leverage than as an actual military operation.