Calhoun red-shirted in 2011 after having shoulder surgery in August. He started 36 games in his career. Calhoun tallied 161 career tackles, 12 tackles for loss and six interceptions for 98 yards.  Calhoun forced three fumbles and tallied one fumble recovery.
In 2013, he ranked 1st in the SEC in interception return yards with 101 yards.  Calhoun caught 3 interceptions on the year and recorded 45 total tackles (33 solo).  Calhoun earned his first career start against Oklahoma State. Scooped up a blocked field goal and returned it 68 yards to the OSU 10-yard line to end the first half.  He intercepted first two passes of career against Alabama. 
New Orleans Saints
On September 2, 2017, Calhoun was waived by the Saints.