Strait of Hormuz threatens 20% of oil

Oil markets are back to obsessing over one narrow stretch of water. The Strait of Hormuz is only 29 nautical miles wide at its narrowest point, but around 20 million barrels a day of oil and fuel pass through it. That is why this week’s renewed clashes between U.S. and Iranian forces matter so much — even after Washington said the offensive phase of “Operation Epic Fury” was over and a defensive escort mission had begun. ### Why is Hormuz the chokepoint? Hormuz is the exit valve for the Persian Gulf. Saudi Arabia, Iraq, Kuwait, Qatar, Bahrain, Iran, and much of the UAE’s export system lean on it to get crude and fuels to market. The channels ships actually use are tiny — just 2 miles wide in each direction with a 2-mile buffer zone — so you do not need a total closure to cause chaos. Harassment, mines, seizures, missile risk, and insurance panic can all slow flows fast. (iea.org) ### How much oil are we talking about? The headline number is big for a reason. The EIA puts average flows through Hormuz at 20.9 million barrels a day in the first half of 2025 — about 20% of global petroleum liquids consumption and one-quarter of global seaborne oil trade. The IEA uses a similar round figure of 20 million barrels a day for 2025 and says roughly 25% of the world’s seaborne oil trade moves through the strait. That is the real basis for the “20% of oil” line. (iea.org) ### Can exporters just go around it? Not really. There are bypass routes, but they are small compared with the problem. The IEA says Saudi Arabia and the UAE together have only about 3.5 to 5.5 million barrels a day of alternative pipeline capacity that can avoid the strait. That helps at the margin, but it does not replace 20 million barrels a day. Basically, the spare door is much smaller than the main hallway. (eia.gov) ### Who gets hit first? Asia gets hit first and hardest. The IEA says 80% of the oil moving through Hormuz is headed to Asia, and China, India, Japan, and South Korea are especially exposed. Europe is less dependent on direct crude flows through the strait, but it still feels the price shock because oil is globally priced and shipping markets are shared. LNG is the other problem — Qatar and the UAE send almost 20% of global LNG exports through Hormuz too. (iea.org) ### What changed this week? The key shift is that the military story and the shipping story stopped moving in opposite directions. Washington has been saying the offensive campaign that began on February 28, 2026, is over, while “Project Freedom” is supposed to protect commercial shipping. But fresh clashes, disabled tankers, and renewed attacks around the waterway showed that a declared transition to defense does not mean normal traffic is back. (iea.org) ### Why are Panama and Malacca suddenly part of this? Because rerouting does not make risk disappear — it spreads it. S&P Global says diversions away from Hormuz are tightening secondary chokepoints including the Panama Canal and the Strait of Malacca. In March, tankers made up more than one-third of Panama Canal transits, overtaking container ships. So the problem is no longer one blocked gate. It is a network getting crowded everywhere else. (war.gov) ### Does this mean an oil shock is guaranteed? No — but the system is fragile enough that even a short disruption can move prices hard. The IEA’s basic point is that a lasting shutdown is unlikely, yet even a brief interruption would hit oil and gas markets significantly because so much volume is concentrated in one place and spare rerouting capacity is limited. That is why traders care about every escort mission, tanker strike, and ceasefire wobble. (spglobal.com) ### Bottom line The Strait of Hormuz story is not really about one map label. It is about how a narrow shipping lane can transmit war into fuel prices, freight costs, and supply-chain stress almost everywhere. This week’s fighting did not prove a full closure is coming. But it did prove the threat is real enough that the whole trade network has started to brace. (iea.org)