Upon the release of When We All Fall Asleep, Where Do We Go?, "Bad Guy" debuted at number seven on the US Billboard Hot 100 on the week ending April 13, 2019, as Eilish's first top ten entry on the chart. It later occupied number two for a total of nine weeks, before ultimately reaching number one on the week ending August 24, 2019. "Bad Guy" ended the record-breaking 19-week run of "Old Town Road" by Lil Nas X featuring Billy Ray Cyrus. At 17, she further became the first artist born in the 2000s to achieve this feat and the youngest since then-16-year-old Lorde topped the ranking with "Royals" in 2013. Internationally, "Bad Guy" reached number one in Australia, Canada, Estonia, Finland, Greece, Hungary, Iceland, Latvia, Lithuania, New Zealand, Norway, and Russia. The song has been awarded multiple certifications, including a tenfold platinum award from the Australian Recording Industry Association (ARIA) and a sextuple one from the Recording Industry Association of America (RIAA). "Bad Guy" was the best-performing global single of 2019 with combined sales and track-equivalent streams of 19.5 million units according to the International Federation of the Phonographic Industry (IFPI). By 2022, "Bad Guy" was streamed over 2 billion times worldwide through Spotify, her first song to do so.
