Biggest Oil Price Shocks in History — 1973 to the 2026 Iran War Compared

Which oil price shocks were the biggest in history?

The answer depends on the measure. By daily volume, the 2026 Iran war is the largest disruption ever recorded. The International Energy Agency (IEA) put peak losses at more than 14 million barrels per day (mb/d), about 13.6% of expected 2026 demand ^[3]. The World Bank counted a 10.1 mb/d fall in global supply in March alone ^[13].

Earlier shocks were smaller per day. IEA figures put peak losses at 4.5 mb/d in the 1973–74 Arab embargo and 5.6 mb/d in the Iranian revolution ^[3]. The 1990–91 Gulf crisis removed 4.3 mb/d ^[3]. By cumulative loss, however, the Iranian revolution still leads. Reuters calculates that the 2026 war had removed about 1.5 billion barrels by the June interim deal ^[3]. Iran lost roughly 4.3 billion barrels of output between 1978 and 1981 ^[3].

Estimates of the share vary with the source. Rapidan Energy Group puts the 1979 shock at 5% of world supply ^[6], while Federal Reserve History gives 7% of world production ^[2]. Economist James Hamilton found that each of the four big shocks between 1973 and 1991 removed 6–9% of world supply ^[7].

How did the 1973 embargo and the 1979 revolution compare?

On 19 October 1973 the Organization of Arab Petroleum Exporting Countries (OAPEC) imposed an embargo on the United States ^[1]. Producers raised their cuts gradually, reaching 4.5 mb/d over three months ^[3]. The price of oil nearly quadrupled, from $2.90 a barrel to $11.65 in January 1974 ^[1]. The embargo was lifted in March 1974, but the higher prices stayed ^[1]. IEA data compiled by the World Bank date the Iranian losses from November 1978 to April 1979 ^[5]. They date the Kuwait disruption from August 1990 to January 1991 ^[5].

There was no collective emergency system at the time. The US prepared rationing plans and told industry to switch from oil to coal ^[4]. The crisis led consuming countries to set up the IEA in 1974 ^[4]. Reuters estimates the embargo removed 530–650 million barrels in total ^[3].

The second shock was driven as much by fear as by lost barrels. Iranian output fell by 4.8 mb/d by January 1979 ^[2]. Federal Reserve History notes that hoarding and strong demand may have mattered more than the outage itself ^[2]. Prices more than doubled between April 1979 and April 1980 ^[2]. Deutsche Bank research, cited by Yahoo Finance, traces a rise from $14 to over $35 a barrel by early 1981 ^[18].

The policy answer came from central banks rather than stocks. Under Paul Volcker, the Federal Reserve raised its funds rate to a peak of 19% in 1981 ^[2]. Inflation fell, but the economy entered its deepest recession since the Great Depression ^[2].

What happened in 1990, 2008 and 2019?

1990. Iraq's invasion of Kuwait and the UN embargo removed about 4.3 mb/d ^[4]. Brent rose from about $17 a barrel in July 1990 to around $36 in October ^[4]. Its 46% gain in September 1990 stood as the record monthly rise until 2026 ^[6]. The IEA prepared to make 2.5 mb/d available within 15 days, including 2 mb/d from stocks ^[4]. Output was disrupted for around four months ^[3].

2008. This shock had no supply outage behind it. Hamilton concluded that the 2007–08 run-up came from strong demand meeting stagnant production ^[7]. West Texas Intermediate (WTI) rose 86%, from $72 in August 2007 to $134 in June 2008 ^[7]. Brent hit a record $147.50 on 11 July 2008 and was near $36 by December ^[10].

2019. Drone and missile strikes on Abqaiq and Khurais disrupted 5.7 mb/d, about 5% of global supply ^[8]. The Center for Strategic and International Studies (CSIS) put the share at about 6% ^[9]. Brent closed 14% higher at $69.02 on the first trading day ^[8]. By 27 September it was only $1.58 above its pre-attack level ^[8]. The IEA did not coordinate a stock release ^[8].

The chart uses each source's start and peak prices. For 1979–81 we use $14 and $35, for 2022 a pre-invasion close of $96.84, and for 2026 a pre-war $72 ^[18,11,14].

How does the 2022 Russia–Ukraine shock compare?

The 2022 shock was mostly about risk rather than lost barrels. Rapidan sizes it at 3% of supply ^[6]. Brent breached $100 on 24 February 2022, up $6.34 to $103.18 ^[11]. In March it reached $139.13, its highest level since 2008 ^[10]. That was about 44% above the pre-invasion close, on our calculation from Reuters figures ^[11].

The policy response was large. IEA members agreed two collective actions of 62.7 million and 120 million barrels, a total of 182.7 million ^[12]. The US alone ordered 180 million barrels over six months ^[4]. Prices stayed mostly above $100 until the summer of 2022 ^[10].

Why is the 2026 Iran war different?

Brent stood at $72 on 27 February, the day before the war ^[14]. It gained about 65%, or $46 a barrel, by the end of March ^[13]. The futures contract peaked at $126.41 at the end of April ^[10]. Unlike the 1970s, the shock hit crude, liquefied natural gas (LNG), refined fuels and fertiliser at the same time ^[3].

The response was also the largest on record. IEA members agreed a release of 400 million barrels ^[3]. MUFG's tally of authorised drawdowns shows how far this exceeds earlier episodes ^[6].

The crisis has also lasted longer than most. A US–Iran interim deal halted the fighting on 17 June ^[3]. Hostilities later resumed. Brent spot reached $131 on 15 September after an attack on Saudi Arabia's East-West pipeline, the US Energy Information Administration (EIA) says ^[15]. By mid-October about 330 million barrels had been released, and members agreed to speed up the remaining 100 million or so ^[16]. December Brent settled at $114.88 on 29 October ^[17].

What about inflation-adjusted prices?

Nominal records flatter recent shocks. Hamilton wrote in 2009 that the late-1970s price of over $40 a barrel would be over $100 at 2009 prices ^[7]. Analyst John Kemp calculated in 2021 that the 2008 Brent peak equalled more than $180 a barrel in 2021 dollars ^[19]. On those estimates, the 2026 peaks of $126–131 remain below the 2008 high in real terms.

Monetary policy has also changed. In March 2026 Fed Chair Jerome Powell said the response would depend on how long the shock lasted ^[18]. Fed Governor Christopher Waller drew the lesson that the 1970s were a sequence of shocks that came to look permanent ^[18].

What to watch

• Duration over peak. The 1979 episode was damaging because losses persisted for years ^[3]. How long Gulf flows stay constrained matters more than any single price spike ^[15].
• Buffers. IEA governments still hold about 1.1 billion barrels of public emergency stocks, against more than 1.2 billion in March ^[20]. The US Strategic Petroleum Reserve (SPR) is at its lowest since 1982 ^[20].
• Talks and the US midterms. Signals about renewed strikes after the elections have kept a premium in prices ^[17].
• Bypass routes. Attacks on pipelines, as in September, can reverse a recovery quickly ^[15].

Alupetra tracks crude, product and freight markets every day; our historical oil price tool lets readers compare today's levels with past shocks.