Album sales

3.1 million: Teenage Dream (2010)
1.74 million: PRISM (2013)
1.73 million: One of the Boys (2008)
311,000: Witness (2017)
63,000: MTV Unplugged EP (2009)

Most-streamed songs, on-demand

1.2 billion: "Dark Horse" (feat. Juicy J)
904 million: "Roar"
526 million: "Firework"
509 million: "Con Calma" (Daddy Yankee feat. Perry & Snow)
481 million: "Last Friday Night (T.G.I.F.)"
401 million: "E.T." (feat. Kanye West)
399 million: "Feels" (Calvin Harris feat. Pharrell Williams, Perry & Big Sean)
394 million: "Hot N Cold"
388 million: "California Gurls" (feat. Snoop Dogg)
323 million: "Swish Swish" (feat. Nicki Minaj)

Best-selling songs

7.4 million: "Firework"
6.6 million: "Roar"
6.4 million: "Dark Horse"
6 million: "E.T."
5.9 million: "California Gurls"
5.8 million, "Hot N Cold"
5 million, "Teenage Dream"
4.8 million, "I Kissed a Girl"
3.8 million, "Last Friday Night (T.G.I.F.)"
3.5 million, "Wide Awake"
Most-heard songs on radio

6.8 billion: "Firework"
6.6 billion: "Dark Horse"
6.3 million: "Teenage Dream"
6.2 billion: "Hot N Cold"
6 billion: "Roar"
5.3 billion: "California Gurls"
4.3 billion: "E.T."
3.8 billion: "Wide Awake"
3.6 billion: "Last Friday Night (T.G.I.F.)"
3.2 billion: "The One That Got Away"