Robbie Kerr began his career in 1991 in karting. In 1997 he was master of the British Formula First. In 1998 he drove in the British Formula Renault Championship. 1999 and 2000, he starred in the Formula Palmer Audi; He achieved his best result in 2000 when he finished third overall. In 2001 he competed in the British Formula 3 Championship and decided the National class of its own. He was British Formula 3 champion in 2002. In 2003, he joined again in to a race weekend of the British Formula 3 and also drove a race in the Porsche Supercup.
After a brief stint in Formula 3000, also in 2003, Kerr played nine races in Formula Renault V6 Eurocup, of which he won one. In the following years he became a mainstay of the Great Britain team in the new A1GP championship, where he was from 2005 to 2008 regularly at the start and was able to achieve three wins. In 2005, he immediately reached for a one-time appearance in the 3000 Pro Series victory, 2006 saw him also with limited success in the World Series by Renault. Then in 2007 he made his debut at the 24 Hours of Le Mans, where he could celebrate second place in the LMP2 class. From 2004 to 2009 Kerr also appeared sporadically in the Le Mans Series. In 2011, he was active in the SPEED Euro Series and therefore still in prototype racing.
Kerr acted beyond in winter 2008/2009 as a test driver of the British Litespeed F3 team.