Who has sold more albums radiohead or nine inch nails?

Radiohead and Nine Inch Nails are both critically acclaimed and commercially successful rock bands. According to various sources, here are the estimated album sales for both artists:

Radiohead:

- Over 30 million albums sold worldwide (as of 2021).

- Their most successful album, "OK Computer", has sold over 10 million copies worldwide.

Nine Inch Nails:

- Over 20 million albums sold worldwide (as of 2022).

- Their most successful album, "The Downward Spiral", has sold over 4 million copies in the United States alone.

While Radiohead has sold more albums overall, Nine Inch Nails' "The Downward Spiral" has outsold Radiohead's most popular album, "OK Computer", in the United States.

It's important to note that these sales figures are estimates and may vary depending on the source.