The war in Iran is increasingly shifting from a regional conflict into a global energy shock, as disruption in the Strait of Hormuz threatens the oil market at its most critical chokepoint.
Key takeaways
- Around 20 million barrels per day (bpd) of oil and petroleum products normally pass through the Strait of Hormuz between Iran and Oman, equal to about one-fifth of global oil consumption and roughly 30% of global seaborne oil trade.
- This is a flow shock, not an inventory problem. Oil markets depend on continuous throughput, not static storage.
- If the disruption persists beyond a few weeks, Brent could shift from a short-term spike to a broader price shock, with stagflation risk.
The world’s most critical oil chokepoint
The Strait of Hormuz handles roughly 20 million barrels per day of oil and petroleum products, equal to about 20% of global oil consumption and around 30% of global seaborne oil trade. With global oil demand near 104 million bpd and spare capacity limited, the market was already tightly balanced before the latest escalation.
The strait is also a critical corridor for liquefied natural gas. Around 290 million cubic metres of LNG transited the route each day on average in 2024, representing roughly 20% of global LNG trade, with Asian markets the main destination.
The International Energy Agency (IEA) has described Hormuz as the world’s most important oil transit chokepoint, noting that even partial interruptions may trigger outsized price moves. Brent crude has moved above US$100 a barrel, reflecting both physical tightness and a rising geopolitical risk premium.
Tankers idle as flows slow
Shipping and insurance data now point to strain in real time. More than 85 large crude carriers are reported to be stranded in the Persian Gulf, while more than 150 vessels have been anchored, diverted or delayed as operators reassess safety and insurance cover. That would leave an estimated 120 million to 150 million barrels of crude sitting idle at sea.
Those volumes represent only six to seven days of normal Hormuz throughput, or a little more than one day of global oil consumption.
A market built on flow, not storage
Oil markets function on continuous movement. Refineries, petrochemical plants and global supply chains are calibrated to steady deliveries along predictable sea lanes. When flows through a chokepoint that carries roughly one-fifth of global oil consumption and around 30% of global seaborne oil trade are interrupted, the system can move from equilibrium to deficit within days.
Spare production capacity, largely concentrated within OPEC, is estimated at only 3 million to 5 million bpd. That falls well short of the volumes at risk if Hormuz flows are severely disrupted.
Oil market analysis
How long do idle tankers last?
135M idle barrels — days of cover against each demand benchmark
vs. Strait of Hormuz daily flow (20M bbl/day)
vs. Global oil consumption (104M bbl/day)
vs. US Strategic Petroleum Reserve release (1M bbl/day)
135M
idle barrels on tankers (midpoint of 120–150M range)
~33%
of daily Hormuz flow that is idle storage, not transit
<31 hrs
is all idle storage against global daily consumption
Scenarios for the weeks ahead
Market trajectories now hinge on the duration and severity of the disruption.
Short disruption, 1 to 2 weeks
If tanker traffic resumes within 1 to 2 weeks, the shock may show up as a sharp but ultimately reversible spike.
Cumulative supply loss would remain relatively limited, while inventories and strategic stocks may partly bridge the shortfall. In that scenario, Brent could trade in roughly the US$95 to US$110 range as traders price temporary disruption and elevated risk premia.
Extended disruption, 2 to 4 weeks
Beyond a fortnight, the cumulative loss becomes more material.
A 2 to 4 week disruption affecting up to 20 million bpd could imply roughly 280 million to 560 million barrels of lost supply. Commercial inventories, floating storage and strategic reserves may then begin to erode more visibly. In that scenario, Brent could shift toward the US$110 to US$130 range, while higher fuel costs may begin feeding into transport and industrial production.
These price ranges are scenario-based and indicative, not forecasts.
If the war ends within four weeks
A ceasefire or credible de-escalation within roughly four weeks would likely trigger a sharp reversal in oil markets, though not an instant reset to pre-crisis levels.
Initially, the unwinding of geopolitical risk premia and the normalisation of tanker traffic could push Brent lower, potentially into the US$80 to US$95 range as speculative and hedging positions are reduced.
Assuming flows are fully restored and further disruptions are avoided, prices could gradually trend back toward the low US$70s over subsequent months, broadly consistent with projections that show inventories rebuilding once supply regains a small surplus over demand.
Inflation risks and macro spillovers
The inflationary impact of an oil shock typically arrives in waves. Higher fuel and energy prices may lift headline inflation quickly as petrol, diesel and power costs move higher.
Over time, higher energy costs may pass through freight, food, manufacturing and services. If the disruption persists, the combination of elevated inflation and slower growth could raise the risk of a stagflationary environment and leave central banks facing a difficult trade-off.
No easy offset, a system with little slack
What makes the current episode particularly acute is the lack of slack in the global system.
Global supply and demand near 103 million to 104 million bpd leave little spare cushion when a chokepoint handling nearly 20 million bpd, or about one-fifth of global oil consumption, is compromised. Estimated spare capacity of 3 million to 5 million bpd, mostly within OPEC, would cover only a fraction of the volumes at risk.
Alternative routes, including pipelines that bypass Hormuz and rerouted shipping, can only partly offset lost flows, and usually at higher cost and with longer lead times.
Bottom line
Until transit through the Strait of Hormuz is restored and seen as credibly secure, global oil flows are likely to remain impaired and risk premia elevated. For investors, policymakers and corporate decision-makers, the core question is whether oil can move where it needs to go, every day, without interruption.
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