E=MC² debuted at number one on the Billboard 200 with 463,000 copies sold, making it the biggest opening week sales of her career. With six number one albums, Carey is now tied with Janet Jackson in the U.S. for the third most number one albums for a female artist, behind Madonna with seven and Barbra Streisand's eight chart toppers. In its second week, the album topped the chart again with 182,000 copies sold. E=MC² is Carey's first album to spend two straight weeks at #1 since 1995's Daydream. The album topped the Billboard's Top R&B/Hip-Hop Albums Chart. The album has sold about 1.2 million copies in the United States and was certified Platinum by the RIAA on July 8, 2008.