Infinity on High with a 54% decline during a post-Grammy week. The album rose to number three in its third week with 79,000 units sold. In its fourth week, the disc slipped to number four and sold 67,000 copies. "Infinity on High"s sales again fell in its fifth week, moving 58,000 copies and descending to number eight on the chart. In its sixth and last week in the top ten it fell to number nine and sold 43,000 copies. In April 2007, the album was certified Platinum by the Recording Industry Association of America (RIAA), denoting the shipment of one million copies. It
Infinity on High talents so compellingly, the album is regrettably haphazard." Caroline Sullivan of "The Guardian" believed that the album was overly sullen, but noted that "They may not be happy, but they haven't forgotten to be catchy." Barry Nicholson of "NME" found the amount of guest producers to be unnecessary and disliked some of the songs, but admired the album's "infectious" nature. "Infinity on High" was a major commercial success, debuting at number one on the US "Billboard" 200 chart, with first week sales of 260,000 copies in the United States, according to Nielsen SoundScan. "Infinity" has sold 1.4 million copies in