He played college football for the Wisconsin Badgers and was selected by the Detroit Lions in the third round of the 2006 NFL draft.
He rushed for over 5,000 yards, scored 82 touchdowns, was named the Gatorade State Player of the Year, team MVP, All-America, first-team all-state, and was ranked the nation's 12th best running back by Rivals.com.
After playing football at Colorado for his freshman (2002) and sophomore (2003) years, Calhoun decided to return home and attend the University of Wisconsin–Madison.
During his two years at Colorado, Calhoun was named the ABC Player of the Game against Nebraska University in 2002 and again against Florida State in 2003.
Calhoun was named the MVP of the 2006 Capital One Bowl, after gaining 213 yards and scoring a touchdown in the Wisconsin Badgers victory over the Auburn Tigers.
After his playing career, he became a high school coach for track and field, football, and sports fitness training in the greater Milwaukee area.