The song peaked at number six on the Billboard Hot 100 and also reached number one of the Adult Contemporary and Adult Pop Songs airplay charts.
"Fight Song" topped the charts in the United Kingdom and also peaked within the top ten of the singles charts in Australia, Canada, New Zealand and the Republic of Ireland and the top twenty of the charts in Slovakia.
It has sold two million copies in the United States, earning a double platinum certification by the RIAA.
On April 25, 2016, this song peaked at number nine on the Billboard Japan Hot 100 chart.
"Fight Song" was named the official theme song of the 2016 IIHF World Women's U18 Championship held in St. Catharines, Ontario, Canada. Each game was opened with images of the participating countries as well as flag bearers who represented each country at center ice as the song played.