What Is the Strait of Hormuz — and Why Does It Matter for Global Oil Prices?

The World's Most Important Oil Chokepoint

The Strait of Hormuz is a narrow body of water connecting the Persian Gulf to the Gulf of Oman and, from there, to the Arabian Sea and global shipping lanes. At its narrowest point, the strait is only 33 kilometres (21 miles) wide. Yet through this sliver of ocean passes approximately 21 million barrels of crude oil and refined petroleum products every single day — roughly 20 to 21 percent of global oil consumption.

To put that figure in perspective: the world consumes approximately 100 million barrels of oil per day. Remove the Strait of Hormuz from the equation, and one-fifth of that supply has nowhere to go. No other single point on the planet concentrates so much of the global energy supply in such a geographically constrained space.

The strait is bordered to the north by Iran and to the south by Oman and the United Arab Emirates. Ships transiting the strait follow two-mile-wide traffic separation schemes — essentially maritime highways — one lane for inbound vessels and one for outbound. The shipping lanes pass through Omani territorial waters, but Iran's coastline and its numerous islands (including Abu Musa, Greater Tunb, and Lesser Tunb) sit directly adjacent to the transit corridor.

What Flows Through the Strait

The countries that depend most heavily on Strait of Hormuz transit are the major oil producers of the Persian Gulf: Saudi Arabia, Iraq, the United Arab Emirates, Kuwait, Qatar, and Bahrain. Iran itself also exports oil through the strait, though under varying levels of international sanctions.

The largest single user of the strait is Saudi Arabia, which exports approximately 6 to 7 million barrels per day through the waterway. Iraq, the world's second-largest OPEC producer, exports nearly all of its oil via the Persian Gulf and the strait. Kuwait and the UAE together add another 4 to 5 million barrels per day.

Beyond crude oil, the strait is also critical for liquefied natural gas (LNG). Qatar — the world's largest LNG exporter — ships virtually all of its LNG production through the Strait of Hormuz. Qatar's LNG exports supply significant portions of Europe's and Asia's natural gas needs. A closure of the strait would therefore affect not only oil markets but also natural gas supplies across multiple continents.

Why the Strait Is So Difficult to Bypass

One of the most common questions about the Strait of Hormuz is: why can't oil producers simply route their exports around it? The answer is that they can — partially — but not completely, and not without significant cost and capacity constraints.

Saudi Arabia operates the East-West Pipeline (also known as the Petroline), which can carry up to 5 million barrels per day from the Eastern Province oil fields to the Red Sea port of Yanbu. This route entirely bypasses the strait. However, the pipeline's capacity is far below Saudi Arabia's total export capacity, and it requires significant infrastructure investment to expand.

The UAE operates the Abu Dhabi Crude Oil Pipeline (ADCOP), which runs from Abu Dhabi to the port of Fujairah on the Gulf of Oman — also bypassing the strait. This pipeline has a capacity of approximately 1.5 million barrels per day.

Iraq has no viable bypass pipeline. Its entire export infrastructure is oriented toward the Persian Gulf, and its northern pipeline through Turkey (the Kirkuk-Ceyhan pipeline) has been repeatedly disrupted by political disputes and sabotage. Qatar has no bypass option for its LNG exports whatsoever.

Even if all available bypass capacity were fully utilised, the total alternative routing capacity amounts to perhaps 6 to 7 million barrels per day — less than a third of normal Hormuz transit volumes. A full closure of the strait would therefore create an immediate and severe global oil supply deficit.

Iran's Strategic Position

Iran's geographic position gives it a unique ability to threaten or disrupt strait transit. Iran's coastline runs along the northern shore of the strait, and the Iranian Revolutionary Guard Corps Navy (IRGCN) operates a large fleet of fast attack craft, submarines, and anti-ship missile batteries positioned to interdict shipping.

Iran has threatened to close the strait on multiple occasions, most notably during the Tanker War of the 1980s (when Iranian and Iraqi forces attacked shipping in the Persian Gulf during the Iran-Iraq War), during the 2011–2012 nuclear sanctions crisis, and again during the 2019 Gulf of Oman tanker attacks. On each occasion, the United States and its allies deployed naval forces to deter Iranian action and protect shipping.

The 2026 conflict has escalated beyond previous crises. Following US-Israeli strikes on Iranian oil infrastructure and nuclear facilities in February 2026, Iran has deployed additional naval assets and mining operations in the strait. While the strait has not been fully closed, transit times have increased significantly due to naval escorts, vessel inspections, and the threat environment, effectively reducing throughput and driving up insurance costs for tankers.

Impact on Oil Prices

The relationship between Hormuz disruption and oil prices is well-established. During the 2019 tanker attacks, Brent crude jumped approximately 4 percent in a single day. During the 1980s Tanker War, oil prices were volatile for years. The current 2026 disruption has produced the most sustained price increase in the strait's history.

The price impact works through several mechanisms. First, there is the direct supply reduction: less oil reaching global markets means higher prices for the oil that does arrive. Second, there is the risk premium: oil traders price in the probability of future disruptions, which means even partial disruptions can cause disproportionate price increases. Third, there is the insurance and shipping cost increase: when tanker insurance rates spike (as they have in 2026), those costs are passed through to buyers, effectively raising the delivered price of oil even if the commodity price itself does not fully reflect the disruption.

The Cape of Good Hope rerouting — where tankers avoid the strait entirely by sailing around southern Africa — adds approximately 10 to 14 days to transit times from the Persian Gulf to European markets, and 6 to 8 days to Asian markets. This effectively removes those vessels from the active supply chain for weeks at a time, tightening the global tanker market and further increasing shipping costs.

Strategic Petroleum Reserves: The Buffer

The primary defence against a Hormuz disruption is the strategic petroleum reserve (SPR) system. IEA member countries are required to hold 90 days of net oil imports in strategic reserves, specifically to buffer against supply disruptions of this type. The United States holds the world's largest SPR, with a capacity of approximately 714 million barrels.

In response to the 2026 crisis, the IEA has coordinated multiple SPR releases among member states. However, strategic reserves are a finite buffer, not a permanent solution. If the disruption continues for months rather than weeks, even the largest reserves will be drawn down to levels that create their own supply anxiety.

Countries outside the IEA — including many of the most import-dependent nations in South Asia, Southeast Asia, and Africa — have far smaller strategic reserves. For these countries, a prolonged Hormuz disruption translates directly into fuel shortages, rationing, and economic disruption within weeks rather than months.

The Path to Resolution

Historical precedent suggests that full closures of the Strait of Hormuz are rare and short-lived, primarily because Iran itself depends on the strait for its own oil exports and imports. A prolonged closure would damage Iran's economy as severely as it would damage global markets. The 1980s Tanker War, despite years of attacks on shipping, never resulted in a complete closure.

The 2026 crisis is different in that it follows direct military strikes on Iranian territory, which have significantly raised the political stakes for any Iranian government seeking de-escalation. The path to resolution likely requires a combination of diplomatic engagement, security guarantees, and some form of economic relief for Iran — a complex negotiation that could take months or years to conclude.

In the meantime, OilCrisisTracker.com continues to monitor the situation in real time, tracking commodity prices, tanker movements, and the Global Crisis Severity Index as the situation evolves.