 " Tik Tok " made its chart debut on the official New Zealand Singles Chart at number seven on the issue dated October 5 , 2009 . The following week it moved up to number one where it held the top spot for a total of five consecutive weeks . The song has since been certified 2 × Platinum by the Recording Industry Association of New Zealand ( RIANZ ) for sales of 30 @,@ 000 units . In Australia the song debuted on the ARIA Charts at number twenty @-@ eight , and reached number one on its third week on the chart . The song was listed atop the chart for a total of eight weeks and in 2009 it was listed at position nine on the Australian Singles Year End Chart . ; the following year the song was listed at position twelve on the 2010 year end chart . It has since been certified 5 × Platinum by the Australian Recording Industry Association ( ARIA ) for sales of 350 @,@ 000 units . The song sold 12 @.@ 8 million digital copies worldwide in 2010 , making it the best selling single of the year , trumping the previous year 's song by more than three million downloads . As of 2012 , it has sold around 14 million copies worldwide . 
