In her career, Clarkson has sold over 24 million albums and 39 million singles worldwide, making her the most successful contestant on a talent show. Stronger (What Doesn't Kill You) (2012), her second single from the album Stronger, is her best-selling single in the US according to American Idol. It was successfully placed in 20 countries. The single sold over 3,8 million copies in the US.

At the inauguration of US President Barack Obama on January 21, 2013, Clarkson sang the patriotic song "My Country, 'Tis of Thee".

Kelly Clarkson can only be booked for private functions.