"E=MC²" entered the Australian Albums Chart on April 5, 2008, at number two. The album spent eight weeks in the albums chart, and was certified Gold by the Australian Recording Industry Association (ARIA), denoting shipments of 35,000 units. In France, the album debuted at its peak position of number six during the week dated April 19, 2008. "E=MC²" spent twenty weeks on the albums chart, and ended its run on August 30, 2008. On the Dutch Albums Chart, it debuted at its peak position of number eleven on April 19, 2008. The album ended its eight-week chart run on June 7, 2008. During the week dated April 28, 2008, "E=MC²" debuted at number ten on the New Zealand Albums Chart, starting a ten-week run on the chart. The album peaked within the top ten in several European countries, such as number five in Switzerland, seven in Germany and Ireland, eight in Austria and number nine in Italy. On the UK Albums Chart, the album debuted at number three, selling 34,800 copies. This was her highest peak position in the United Kingdom since "Butterfly" (1997), which peaked at number two. After thirteen weeks on the chart, the album was certified Gold by the British Phonographic Industry (BPI), denoting shipments of 100,000 copies. In Japan, the album peaked at number seven on the Oricon Overall Chart, and was certified Gold by the Recording Industry Association of Japan (RIAJ) for shipments of 100,000 copies. After only eight days of release, "E=MC²" was certified Gold in the Philippines, denoting shipments of 15,000 units. The album was the 26th best-selling album worldwide in 2008, according to International Federation of the Phonographic Industry (IFPI). As of September 19, 2009, the album has sold 2.5 million copies worldwide.