Infinity on High finished the year at number twenty-one on IFPI's list of the "Top 50 Global Best Selling Albums of 2007". "Infinity on High" has shipped over two million copies worldwide. The album also charted inside the top five worldwide, making it the band's most successful and breakthrough album internationally. "Infinity on High" charted all over Europe, debuting at number eight on "Billboard"'s European Albums chart. In Australia, it debuted at its peak of number four on the Australian ARIA Albums Chart. It remained on the Australian chart for a total of fifty weeks, spending its first seven weeks in the top
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