Explainer: US-Iran war still trails the 1979 oil shock by total losses

• Peak supply losses exceeded 14 million bpd (13.6% of global demand), far surpassing the 1973 Arab embargo (4.5 million bpd), 1979 Iranian Revolution (5.6 million bpd), and 1991 Gulf War (4.3 million bpd)
• Cumulative losses reached approximately 1.5 billion barrels during the conflict, compared to 2.7+ billion barrels lost during 1979-1980 Iranian Revolution and only 530-650 million barrels during the 1973-74 embargo
• The crisis also shut down roughly one-fifth of global LNG production in Qatar (about 5.6% of annual global supply) and disrupted Gulf refineries that supply diesel and jet fuel to Africa, Europe, and Asia

Summary: US-Iran War Versus Historical Oil Shocks

The recent U.S.-Israeli war on Iran has created the largest daily oil supply shock on record but falls short of the 1979 Iranian Revolution in total cumulative losses, according to Reuters analysis of IEA, OPEC, and U.S. Department of Energy data.

Key Figures

Current Crisis (Iran War):

• Peak supply loss: 14 million barrels per day (bpd), representing 13.6% of global demand (103.3 million bpd)
• Cumulative losses: Approximately 1.5 billion barrels through the June 17 interim ceasefire
• LNG disruption: ~24 million metric tons removed (5.6% of global supply), affecting one-fifth of Qatar's production
• IEA strategic reserve release: Record 400 million barrels

Historical Comparisons (Peak Daily Losses):

• 1979 Iranian Revolution: 5.6 million bpd (cumulative: 4.3 billion barrels over 1978-1981)
• 1973-74 Arab Oil Embargo: 4.5 million bpd (cumulative: 530-650 million barrels)
• 1991 Gulf War: 4.3 million bpd (cumulative: ~516 million barrels)

Market Implications

This crisis differs from previous shocks by simultaneously disrupting crude oil, natural gas, refined fuels, and fertilizers—exposing vulnerabilities in globalized energy markets. The conflict impacted Gulf refineries that supply diesel and jet fuel to Africa, Europe, and Asia, creating widespread shortages.

Despite the June 17 interim deal, disruptions are expected to persist for months, with gas supply impacts potentially lasting years. The Iranian Revolution remains the largest oil crisis by total volume lost, though the current conflict surpasses all previous crises in daily production impact.