As a redshirt freshman in 2012, he played in all 13 games as a backup. He recorded 6 tackles (2.5 for a loss, including 1 sack) and 2 passes defensed. His first year as starter, as a sophomore in 2013, he posted 37 tackles (14 for a loss, including 7.5 sacks), 1 interception, 4 fumble recoveries, and 2 forced fumbles. He was named a second team All-American by numerous publications and was a finalist for the Ted Hendricks Award.[1][2] Although he was eligible for the 2014 NFL draft, he decided to return for his junior season.[3] During his junior year in 2014, he posted 39 tackles (12.5 for a loss, including 8 sacks), 1 fumble recovery, and a forced fumble. He was expected to leave college and enter the 2015 NFL draft, but he returned to school for his senior year and, during the 2015 season, he collected 49 tackles (15 for a loss, including 10.5 sacks), 3 passes defensed, and a forced fumble. He finished his four-year college career with 27 sacks, 131 tackles (44 tackles for a loss), four forced fumbles, five fumble recoveries, and one interception.
On April 29, 2016, Calhoun was selected in the third round (75th overall) of the 2016 NFL draft.[5] On May 17, 2016, it was announced that Calhoun would wear number 91, formerly held by Justin Tuck.[6][7] On June 17, 2016, Calhoun signed with the Oakland Raiders.[8][9] He played in 10 games as a rookie recording nine tackles and a pass defensed before being placed on injured reserve on December 23, 2016.[10]
On September 2, 2017, Calhoun was waived by the Raiders and was signed to the practice squad the next day.[11][12] He was promoted to the active roster on October 14, 2017.[13]
On September 12, 2018, Calhoun was waived by the Raiders and was re-signed to the practice squad.[14] He was promoted back to the active roster on September 18, 2018.[15] He was placed on injured reserve on December 5, 2018.[16]
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