In the United States, "Used to Love You" debuted at number three on the Bubbling Under Hot 100 Singles chart, which serves as an extension to the "Billboard" Hot 100. It entered the Hot 100 at number 84 for the week ending November 14, 2015, in addition to debuting at number 40 on the Pop Songs component chart. Following a performance at the American Music Awards of 2015, "Used to Love You" re-entered the Hot 100 at number 77, its new peak. The performance helped sell an additional 29,000 digital copies, also prompting her to chart on the Artist 100 at number 82. The single lasted a total of nine weeks on the Hot 100, peaking at number 52 in December 2015, and departing its position of number 80 in January 2016. The week after Stefani performed "Used to Love You" on "The Voice", the single peaked at number 14 on the Digital Songs component chart, given Stefani the highest increase for the week ending December 19, 2015. On October 27, 2015, it was released to contemporary hit radio in the United States. Its radio adds prompted the track to enter the Adult Top 40, where it peaked at number 10, spending a total of 15 weeks on the charts. It was Stefani's second highest peak on the chart, nearing 2005's "Cool" peak of number 4. For the week ending January 16, 2016, the song peaked at number 21 on the Adult Contemporary chart and Mainstream Top 40 charts, her highest entry ever for the former, and second lowest entry for the latter. On March 11, 2016, "Used to Love You" was certified gold by the Recording Industry Association of America, reporting sales of over 500,000 copies. This marked Stefani's first certification since her single "Hollaback Girl" in 2005.