WASHINGTON, July 20 — The opening salvos in the latest US-Iran confrontation sent global oil prices climbing on July 20, with Brent crude jumping 3 percent to $87.50 per barrel. The strike came after months of rising tensions and marks the first sustained military action between the two countries since earlier skirmishes in 2019-2020. Iran, which holds the world’s fourth-largest proven crude oil reserves — over 200 billion barrels — produces about 3 million barrels per day.
Before the strikes, Brent crude had averaged around $85 per barrel in early 2025. The price spike is the sharpest one-day move since the 2019-2020 escalation when oil briefly surged to $70.
The Numbers Behind the Conflict
The immediate price reaction reflects deep anxiety about supply disruption. The 1979 Iranian Revolution offers a stark precedent: crude prices soared from $13 to $40 per barrel. This time, the stakes are magnified by Iran’s strategic choke point — the Strait of Hormuz, through which 20 to 25 million barrels of oil flow daily, representing about 20 percent of global consumption.
Insurance rates for tankers transiting the strait have already risen 15 percent, a clear signal that maritime risk is being priced in. Iran’s oil exports, largely sold to China using a sanctioned “gray fleet” of tankers, could be blocked entirely by a naval quarantine.
The US has a strategic petroleum reserve of about 350 million barrels as of 2025, down sharply from a peak of 727 million in 2009. Domestic crude production stands at a record 13 million barrels per day, according to the Energy Information Administration, offering some buffer.
Global Ripples from the Strait of Hormuz
Goldman Sachs has forecast a 5 percent increase in oil prices for every 1 million barrels per day of supply disruption. With Iran producing roughly 3 million bpd, even partial blockage could drive prices significantly higher. Stock markets reacted negatively: the S&P 500 fell 1.2 percent on the first day of sustained strikes.
Investors moved into safer assets — gold rose to $2,200 per troy ounce, and the US dollar strengthened. Oil exporting nations such as Saudi Arabia, with a capacity of 10 million bpd, and Russia, with 10.5 million bpd, could increase output to stabilize markets but have not yet done so.
For now, the key question is whether the conflict widens. If the Strait of Hormuz becomes a daily battleground, the Math behind oil prices changes quickly — and the world’s consumers will watch the next barrel count.
