The Strait of Hormuz is effectively closed. What does that mean?

How Iran closed the world's most critical oil chokepoint without firing a shot

Here's the remarkable thing about the Hormuz closure of 2026: Iran didn't need to physically blockade the strait. On February 28, following US and Israeli strikes on Iran under Operation Epic Fury, the Islamic Revolutionary Guard Corps broadcast warnings via VHF radio to vessels in the strait: "No ship is allowed to pass." Iran's IRGC commander stated the strait was "closed."

Then came the drone strikes — not enough to sink tankers, but enough to damage a few and create visible risk. That was sufficient. Within 48 hours, Gard and Skuld (two of the world's largest marine insurers) announced suspension of war-risk cover for Gulf routes. The London P&I Club and NorthStandard followed. Without insurance, no commercial operator will move a vessel worth hundreds of millions of dollars through a war zone.

The result: Maersk, Hapag-Lloyd, CMA CGM, and MSC — the four largest container shipping companies — all suspended Gulf operations. Over 150 tankers anchored outside the strait. Iraq, unable to export its oil, began shutting down production at its largest oil fields. Traffic went from 20 million barrels per day to near zero.

As RBC's Helima Croft observed: "All Iran had to do was several drone strikes in the vicinity of the Strait of Hormuz, and all of a sudden, insurers and shipping companies decided that it was unsafe to traverse that very narrow S-curve."

What the Strait of Hormuz actually is

The strait is a narrow waterway connecting the Persian Gulf to the Gulf of Oman and the Arabian Sea, sitting between Iran to the north and Oman (and the UAE) to the south. At its narrowest point, it's just 33km (21 miles) wide. The actual shipping lane in each direction is only 3km (2 miles) wide — barely enough for the world's largest crude oil tankers to pass in two-lane traffic.

Despite its geography, it's the single most important oil chokepoint on Earth. The crude oil passing through originates from Iran, Iraq, Kuwait, Qatar, Saudi Arabia, and the UAE. In 2024, an average of 20 million barrels per day transited the strait, according to EIA data — equivalent to about 20% of global petroleum liquids consumption and over one-quarter of all seaborne oil trade.

Beyond oil, approximately one-fifth of global LNG trade also passes through Hormuz, primarily from Qatar. QatarEnergy has already halted LNG production at its Ras Laffan export site, citing military attacks nearby. European natural gas prices jumped from €30/MWh to over €60/MWh in the first days of the crisis before settling back to around €48/MWh.

Are there alternative routes?

Yes, but they're far from sufficient. Two partial bypass routes exist:

Saudi Arabia's East-West pipeline: Runs from Abqaiq on the Gulf coast to Yanbu on the Red Sea. Normal capacity is 5 million barrels/day, temporarily expandable to 7 million. Saudi Aramco has been increasing use of this route. However, Yanbu's loading terminal infrastructure limits practical throughput, and the Red Sea route itself is disrupted — Houthi-controlled Yemen announced resumption of attacks on commercial shipping on February 28, forcing rerouting around Africa's Cape of Good Hope and adding weeks to transit times.

UAE's Abu Dhabi Crude Oil Pipeline: Runs to Fujairah on the Gulf of Oman, bypassing Hormuz. Capacity is approximately 1.5 million barrels/day. Together with the Saudi pipeline, KPLER estimates about 2.6 million barrels/day of bypass capacity could be made available — a fraction of the 20 million that normally transits Hormuz.

The arithmetic is stark: even full use of both bypass routes replaces roughly 13% of Hormuz throughput. The other 87% either finds alternative global supply — or doesn't reach markets.

Who gets hurt most: country by country

The Hormuz closure hurts Asian economies most severely. Approximately 82% of Hormuz oil flows to Asia, with China, India, Japan, and South Korea accounting for 69% of all crude transiting the strait.

The US is notably less directly exposed — it's a net oil exporter — but this does not make US households immune. Oil is a global market. When supply tightens anywhere, prices rise everywhere. US gasoline prices track Brent crude closely regardless of domestic production levels.

The LNG crisis running in parallel

This is the aspect of the Hormuz closure that most coverage misses. The strait isn't just about oil. Approximately one-fifth of global LNG trade passes through it — primarily from Qatar, which is one of the world's largest LNG exporters.

QatarEnergy halted LNG production at Ras Laffan on March 3 citing military attacks on its export site. European natural gas prices immediately spiked — from €30/MWh to over €60/MWh, briefly more than doubling. This directly feeds into UK and European household energy bills, which are already elevated from the 2022 energy crisis. For European households on variable tariffs, a sustained Hormuz-LNG disruption could mean energy bill increases of 30–50% on top of current levels within one billing cycle.

The timeline: what happened and what comes next

What the household cost looks like at different resolution timelines

The duration of the disruption determines the household bill. A brief spike that resolves in 2–3 weeks has a very different household cost impact than a sustained disruption lasting months.

Frequently asked questions