The Iranian rial's long journey from silver coins to a million-to-one dollar exchange rate

History · Published 29 September 2026 Swipe more like this →

In short: The official currency of Iran has undergone a dramatic transformation since its inception in the late 18th century. Once a silver coin worth a fraction of a toman, the rial has faced decades of volatility, international sanctions, and persistent inflation, leading to its current status as a heavily devalued national unit.

First introduced in 1798, the rial originally functioned as a silver coin valued at 1,250 dinars. It was later integrated into a decimal system in 1825 before being briefly retired. The currency returned in 1932, replacing the qiran at par and establishing a new decimal structure. Throughout the 20th century, the rial was pegged to various international benchmarks, including the British pound and the U.S. dollar, reflecting the shifting economic landscape of the nation.

The post-1979 era marked a period of significant instability. Following the Islamic Revolution, capital flight—estimated between $30 and $40 billion—triggered a sharp decline in the rial's value. The central bank has historically managed the currency through a mix of state-controlled oil revenues and, at times, a multi-tiered exchange system that favored state enterprises. However, international sanctions and persistent inflationary pressures have frequently widened the gap between official and unofficial market rates, leading to severe fluctuations.

By the mid-2020s, the currency faced unprecedented challenges. In December 2025, the rial hit a record low of 1.42 million to the U.S. dollar, a collapse that contributed to the resignation of Central Bank Governor Mohammad Reza Farzin. This devaluation, exacerbated by regional tensions and economic isolation, has prompted repeated government efforts to redenominate the currency. Proposals to slash zeros and rename the unit to the toman have been debated for decades, reflecting a long-standing attempt to simplify a currency system strained by years of economic turbulence and rapid inflation.

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