Strait of Hormuz Explained: Why This 33-Kilometre Chokepoint Keeps Moving Oil and Gas Prices

On 18 October 2026, Al Jazeera reported an Iranian claim that two oil tankers, each carrying about two million barrels of crude, had caught fire after striking naval mines in the Strait of Hormuz. The claim, attributed to Iran’s Islamic Revolutionary Guard Corps, was not independently confirmed, and United States officials disputed it. Yet within hours it was being discussed in trading rooms and ministries worldwide — because everyone in energy markets knows what this stretch of water carries.

Canadians felt the latest cycle at the pump. Statistics Canada reported inflation of 3.1% in September 2026, with gasoline up 27.8% year over year, energy prices up 19.0% and fuel oil up 57.8%, partly as crude rose amid Middle East uncertainty. Excluding gasoline, inflation slowed to 2.2%. A distant chokepoint does not raise every price equally — but it can move fuel costs fast enough to change a national inflation print.

Where it is, and how narrow it really is

The Strait of Hormuz connects the Persian Gulf with the Gulf of Oman and the Arabian Sea. It is the only sea passage out of the Gulf for Saudi Arabia, Iraq, Kuwait, Qatar, the UAE, Bahrain and Iran itself. At its narrowest, between Iran and Oman’s Musandam Peninsula, it is about 33 kilometres (21 miles) wide.

That number flatters the real constraint. Tankers follow a Traffic Separation Scheme: one lane roughly two miles wide inbound, one roughly two miles wide outbound, a two-mile buffer between them. Because both coastal states claim territorial seas of 12 nautical miles, there is effectively no strip of high seas at the narrows — every ship sails a predictable route inside someone’s territorial waters, concentrated into two thin conveyor belts that are easy to monitor, easy to disrupt and impossible to widen. The ships are enormous: a Very Large Crude Carrier is roughly 330 metres long and typically carries about two million barrels.

The numbers: a fifth of the world’s oil, a fifth of its LNG

According to the U.S. Energy Information Administration (EIA), oil flows through the strait averaged about 20 million barrels per day in 2024 — about 20% of global petroleum liquids consumption and more than a quarter of all seaborne oil trade. The EIA put the first-half 2025 average at 20.9 million barrels per day — structural volumes no other route can quietly absorb.

Gas is the second exposure. More than one fifth of global liquefied natural gas (LNG) trade also transited the Strait of Hormuz in 2024, primarily from Qatar — about 11.4 billion cubic feet per day in early 2025, on EIA figures. Qatar sends almost all its LNG out this way. Close to nine tenths of the crude and condensate is bound for Asia, above all China, India, Japan and South Korea. Yet prices move everywhere, because oil is priced in one global market — a driver in Québec competes indirectly for the same marginal barrel as a buyer in Shanghai. That is the channel behind Canada’s gasoline figure, and the hard-asset question covered in Gold vs Silver.

Why prices move before a single barrel is lost

Oil markets do not wait for a physical shortage; they price the probability of one, immediately. In June 2025, with no blockage at all, Brent still rose from $69 a barrel on 12 June to $74 on 13 June as tensions escalated, the EIA documented. That extra amount is a risk premium — insurance paid today against barrels that might not arrive tomorrow.

The second channel is the cost of moving oil at all. After the June 2019 tanker attacks in the Gulf of Oman — the Kokuka Courageous and Front Altair, a month after four tankers were attacked off Fujairah — Brent jumped about 4% on the day, and insurance repriced within days. War-risk premiums for supertankers rose to at least $185,000 per voyage, from about $50,000 after the May attacks, according to Bloomberg reporting. Japanese shipping sources put the additional war-risk charge at 0.25% of a ship’s value, ten times the 0.025% charged weeks earlier. Those charges flow into freight, then into crude’s landed cost, then into gasoline and heating oil.

The third channel is behaviour: owners pause bookings, charterers pay up for tonnage early, refiners draw inventories. Each response tightens the market a little more — no formal closure required. That is why the Strait of Hormuz moves prices in almost every cycle, including cycles where, in the end, the oil kept flowing.

The bypass problem: pipelines cannot replace the strait

Two pipelines were built to reduce this dependence. Saudi Arabia’s East–West Pipeline (Petroline) runs roughly 750 miles from Abqaiq to Yanbu on the Red Sea, with design capacity estimated at about 7 million barrels per day after expansions. The UAE’s Abu Dhabi Crude Oil Pipeline runs from Habshan to Fujairah, outside the strait, at about 1.5 million barrels per day, with total capacity close to 1.8 million.

Three corrections apply. First, nameplate is not available capacity: the International Energy Agency estimates the two systems together could provide roughly 3.5 to 5.5 million barrels per day of usable bypass — less than a third of normal flow through the Strait of Hormuz. Second, they help only their owners: Iraq, Kuwait and Qatar have no equivalent outlet. Third, the Saudi route ends on the Red Sea, so cargoes then face Bab el-Mandeb and Suez, or a Cape of Good Hope detour adding roughly 10 to 15 days to an Asia–Europe voyage. For gas there is no partial answer: no pipeline carries Qatari LNG around the strait.

The spare-capacity trap, and what disruption really looks like

Much of the world’s spare oil production capacity — the extra barrels producers switch on when supply fails elsewhere — sits inside the Gulf, above all in Saudi Arabia. The IEA has warned that a prolonged disruption therefore removes part of normal supply and part of the buffer meant to replace it: losing the supplier plus the fire brigade.

In practice, disruption is rarely one dramatic closure. It is a sequence: an incident, an insurance spike, owners pausing or demanding escort, slower transits, flows thinning day by day — the pattern reported in October 2026. IEA member stockpiles are the official shock absorber: effective for weeks of severe loss, not a substitute for a closed Strait of Hormuz.

What readers in Canada can sensibly do

None of this argues for panic — it argues for proportionate preparation, bought calmly and ideally on sale rather than mid-spike, one reason we track these categories in our Black Friday 2026 deals coverage. A risk-premium spike often fades faster than one driven by lost physical supply, so avoid expensive long commitments in a headline’s first week. Cover the realistic Canadian scenario — a winter outage in an expensive-energy month — with efficiency and modest resilience.

Frequently asked questions

How much oil passes through the Strait of Hormuz each day?

About 20 million barrels per day on the EIA’s 2024 average — roughly 20% of global petroleum liquids consumption and more than a quarter of seaborne oil trade.

How wide are the shipping lanes?

The strait is about 33 kilometres wide at its narrowest, but tankers use lanes roughly two miles wide in each direction, separated by a two-mile buffer.

Could pipelines replace the strait if it closed?

Only partly: an IEA-estimated 3.5 to 5.5 million barrels per day of available bypass capacity, against roughly 20 million barrels per day of normal flow — and no pipeline alternative at all for Qatari LNG.

Why do Canadian gasoline prices rise if Canada barely imports Gulf oil?

Oil is priced globally, so a Gulf risk premium raises benchmark prices everywhere. Statistics Canada recorded Canadian gasoline up 27.8% year over year in September 2026, with energy the main driver of that month’s inflation increase.

Has the strait ever been fully closed?

It has been threatened and repeatedly disrupted — from the Tanker War of the 1980s to the 2019 attacks — but sustained total closure remains a risk markets price, not an event that has happened. Prices move on the risk alone: the central lesson of every cycle.

Sources: EIA chokepoint analysis (June 2025, updated 2026); Statistics Canada September 2026 CPI reporting (19 October 2026); IEA bypass-capacity estimates; Al Jazeera, 18 October 2026, as reported and not independently confirmed.