Metallica's 1991 album Metallica had sold over 30 million copies worldwide according to widely cited figures.
The figure reflects the album's extraordinary longevity rather than only its initial release success. It debuted at number one in ten countries, spent four consecutive weeks atop the Billboard 200, and continued selling through repeated reissues and renewed interest in Metallica's catalog.
In the United States, the album became the first release of the Nielsen SoundScan era to surpass 20 million copies. The SoundScan system began tracking sales in 1991, making the achievement especially significant for measuring modern album performance.
The worldwide total and the United States total are different measurements, so they should not be treated as interchangeable. The album was also certified 2× Diamond by the Recording Industry Association of America in 2025, reflecting at least 20 million U.S. units under RIAA certification rules.