 On November 17, 2007, "Piece of Me" debuted at number sixty-five on the U.S. Billboard Hot 100. On February 9, 2008, the song peaked at number 18. It was the second consecutive single from Blackout to reach number one on the Billboard Hot Dance Club Songs chart. The song shipped over 1,000,000 copies in the United States, earning a platinum certification by the Recording Industry Association of America (RIAA). As of March 2015, "Piece of Me" has sold 1.9 digital downloads in the United States according to Nielsen SoundScan. It is her sixth best-selling digital single in the country. In Canada, the song entered the Canadian Hot 100 at number thirty-seven on November 17, 2007. On April 26, 2008, it reached its peak position of number five. "Piece of Me" was certified platinum by the Canadian Recording Industry Association (CRIA) for paid digital downloads of 40,000.
