Iran says it can close the Strait. The United States says it increasingly controls a safe passage through it. Ship-tracking services report surprisingly little traffic. Meanwhile oil continues to reach world markets and, despite considerable volatility, Brent crude has recently been trading around US$90 a barrel.
So what is actually happening?
Perhaps the most useful question isn't whether the Strait is "open" or "closed".
It is:
How much Middle Eastern oil is actually reaching world markets compared with before the war?
Before the War
The starting point is reasonably clear.
According to the US Energy Information Administration, around 20.9 million barrels of oil per day passed through the Strait of Hormuz in the first half of 2025.
That represented roughly 20% of the world's petroleum consumption and about one quarter of all oil traded by sea.
It explains why predictions of a complete closure of Hormuz produced some frightening forecasts for oil prices.
If 20 million barrels per day suddenly disappeared from world markets, the consequences would be enormous.
But that isn't what happened.
The Initial Collapse
When the US-Iran conflict erupted, traffic through the Strait fell dramatically.
By March, Persian Gulf oil exports had fallen to around 5–6 million barrels per day, according to estimates subsequently reported by Goldman Sachs.
That was an extraordinary disruption.
But since then something important has happened.
The Gulf oil-export system has adapted.
Oil Is Moving Again
By late August, Goldman Sachs estimated that total exports of crude oil and petroleum products from the Persian Gulf had recovered to around:
15–16 million barrels per day.
That is still around 7–8 million barrels below pre-war levels, but it is a remarkable recovery from the March low.
Goldman also estimates that 8–10 million barrels per day may now be passing through Hormuz itself, broadly supporting figures being quoted by US officials.
The United States has reportedly established a protected southern shipping corridor near the Omani side of the Strait. Tankers are being moved through in organised groups, often at night and under US military protection.
Commercial ship trackers see less.
Some estimates based on conventional tracking have put actual Hormuz flows at only 2–6 million barrels per day.
But there is a reason for the discrepancy.
Many tankers are deliberately switching off their AIS tracking systems while making the dangerous passage. These "dark" movements are therefore difficult for normal commercial tracking systems to measure.
So neither figure can be regarded as precise.
But there is now enough evidence to conclude that substantial quantities of oil are again moving through Hormuz.
The Pipelines Around Hormuz
There is another part of the story that receives less attention.
Oil producers have increasingly used routes that bypass Hormuz altogether.
The two most important are Saudi Arabia's East-West pipeline to the Red Sea and the UAE pipeline from Abu Dhabi to Fujairah on the Gulf of Oman.
The International Energy Agency estimates that these routes potentially provide around 3.5–5.5 million barrels per day of available bypass capacity.
Saudi Arabia's East-West system has considerably greater total capacity, although some of it was already being used before the war. The UAE's Habshan-Fujairah pipeline currently carries roughly 1.8 million barrels per day, and the UAE is already working to expand it.
Iraq is also attempting to increase exports through Türkiye, while other alternative routes are being investigated or expanded.
None of these can replace Hormuz completely.
But collectively they matter.
So How Open Is Hormuz?
This is where terminology becomes important.
If we measure only oil physically passing through the Strait, the answer appears to be:
| Oil Flow | Approx. million barrels/day |
|---|---|
| Pre-war through Hormuz | 20.9 |
| March crisis low – Gulf exports | 5–6 |
| Current estimated Hormuz traffic | 8–10 |
| Current total Gulf exports | 15–16 |
On that basis, the Strait itself is probably carrying only about 40–50% of its former oil volume.
But that doesn't tell us how much Gulf oil is actually reaching the world.
Once pipelines and other alternative routes are included, the figure rises to around 15–16 million barrels per day.
Compared with roughly 21–23 million barrels per day before the conflict, that suggests something like two-thirds to three-quarters of the Gulf's previous oil-export capability has effectively been restored.
That is probably the most meaningful measure.
The Hormuz Oil Flow Meter
Pre-war effective oil flow: 100%
March low: ~25%
Current Strait flow: ~40–50%
Current total Gulf exports, including bypasses: ~65–75%
🟥 March crisis
███░░░░░░░ ~25%
🟧 Strait today
█████░░░░░ ~45%
🟨 Total exports today
███████░░░ ~70%
🟩 Pre-war
██████████ 100%
Last updated: 31 August 2026. Figures are estimates compiled from EIA, IEA, Goldman Sachs, Reuters, Axios and published tanker-tracking data.
The Oil Price Provides Another Clue
There is another useful reality check: the market itself.
Brent crude has recently been trading around US$85–95 a barrel.
That is expensive oil.
But it is hardly the price one might expect if 20% of the world's oil supply had genuinely disappeared.
Markets don't know everything, but millions of buyers, sellers, refiners, producers and traders have enormous financial incentives to discover whether oil is actually available.
The relative stability of oil around this range therefore provides some indirect support for the physical-flow estimates.
The market appears to be saying that there is a serious supply problem — but not a catastrophic one.
Open, Closed — Or Something In Between?
The answer to the headline question is therefore:
Yes and no.
The Strait of Hormuz is certainly not "open" in the normal pre-war sense.
Ships face military threats. Some travel under US protection. Others switch off their tracking systems. Insurance and freight costs have risen dramatically. Iran retains the ability to disrupt traffic.
But neither is Hormuz effectively closed.
Millions of barrels are passing through every day, while several million more bypass the Strait through pipelines and alternative export routes.
Perhaps the best description is that the Strait is partially open, while the Gulf oil-export system has become increasingly successful at routing around the blockade.
If the latest estimates are approximately correct, the world has recovered something approaching 70% of the oil flow that existed before the war.
That may explain something that otherwise looks puzzling.
Six months into a war involving Iran, the United States and Israel — centred on the world's most important oil chokepoint — Brent crude is around US$90 rather than US$150 or US$200.
The oil is getting out.
Not all of it.
Not safely.
And certainly not normally.
But considerably more than the word "closed" would suggest.
Previous Posts on the Iran War
For readers who have been following the story, these earlier Grappy's Soap Box posts trace the changing course of the conflict:
Stop Negotiating. Let Iran Come Begging. — Why continued negotiations risked giving Tehran time and economic breathing space.
Talking Peace, Firing Missiles — The strange reality of a ceasefire accompanied by continuing Iranian attacks and threats to shipping.
The Deal That Isn't A Deal — A look at the US-Iran memorandum and the promise that normal shipping through Hormuz would resume.
Time To Finish The Job — Why the breakdown of that agreement and continuing attacks on shipping changed the strategic equation.




