What is the weakest currency in the world?

Written by Editorial Team | Last Updated: August 2026

The Iranian Rial (IRR) is widely recognized as the weakest currency in the world when evaluated on open-market and unofficial exchange rates. Decades of heavy international economic sanctions, chronic inflation, geopolitical isolation, and constrained access to global trade have severely eroded its purchasing power, resulting in open-market exchange rates where over a million rials are routinely required to purchase a single U.S. dollar. Other frequently cited weak currencies include the Vietnamese Dong and Lao Kip.

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