Strait of Hormuz Closure Threatens Global Crude Supply as Temporary Buffers Dwindle

The ongoing conflict in Iran has forced the closure of the Strait of Hormuz, eliminating a daily flow of roughly 20 million barrels of oil and refined products. For crude oil alone, pre-conflict transit through the strait averaged about 15 million barrels per day, representing roughly one-third of the 45 million barrels per day of global crude trade. With global production and refined-product output near 100 million barrels per day, the loss constitutes the largest single-source supply shock on record.

Brookings Institute

Analysts identify three principal forces moderating price movements. First, structural adjustments—such as pipeline bypasses and the activation of new crude sources—provide a permanent offset to the shortfall. Second, existing global inventories act as temporary buffers, absorbing supply volatility in the short term. Third, market participants broadly expect the strait’s impasse to be resolved quickly, a belief that has tempered price spikes despite the scale of the disruption.

Brookings Institute

The International Energy Agency (IEA) estimates that pre-war crude shipments through the strait accounted for 15 million barrels per day, while total global crude trade stands at about 45 million barrels per day. Consequently, the closure potentially disrupts one-third of worldwide crude flows. If structural and temporary measures fail to fully compensate, the resulting deficit could be sufficient to push energy prices toward levels associated with a global recession.

Brookings Institute

Since the conflict began, crude benchmarks have remained below the 2022 peaks observed after Russia’s invasion of Ukraine, reflecting the dampening effect of the three moderating forces. However, price trajectories have shown sharp swings tied to shifting expectations about the strait’s duration. Should market sentiment turn increasingly pessimistic regarding a swift resolution, analysts warn that oil prices may rise materially higher as temporary inventories are drawn down over the coming months.

Brookings Institute

Sources agree on the magnitude of the supply shortfall but differ on the durability of temporary buffers. No precise timeline is provided for how long inventories can sustain the market, and the extent to which structural adjustments can be scaled up remains uncertain. This lack of definitive data creates a gap in forecasting the exact point at which price pressures could become acute.

Brookings Institute

• “The shortfall in global oil supply due to the closure of the Strait of Hormuz has roiled markets and prompted discussions of a global recession.” — Brookings Institution, Analysis

Brookings Institute

• “Structural versus temporary forces in global oil markets Sharp crude price gains have been constrained by three primary factors.” — Brookings Institution, Analysis

Brookings Institute

• “From this perspective, the current market for crude is characterized as a race between the levels of temporary buffers and expectations for the duration of the impasse.” — Brookings Institution, Analysis

Brookings Institute

• “And if markets grow increasingly pessimistic over an eventual resolution to the impasse in the strait, oil prices may rise materially higher.” — Brookings Institution, Analysis

Brookings Institute

• “Prior to this conflict, around 20 million barrels of oil and refined product transited the Strait of Hormuz daily, with volume markedly lower in recent months.” — Brookings Institution, Analysis

Brookings Institute

Analysts project that temporary inventory cushions will erode over the next several months. Monitoring of inventory levels, pipeline bypass utilization, and any diplomatic developments affecting the strait will be critical for anticipating when structural adjustments alone must bear the full weight of the supply deficit, potentially triggering a sharper rise in crude prices.

Brookings Institute