The Atlanta, Ga., native saw action in one game in 2005 against Western Kentucky as a redshirt freshman. Booker redshirted during the 2004 season.
"Calvin has been a valuable member of this program since his arrival two years ago," head coach Tommy Tuberville said. "We hate to see him leave and wish him the very best."
Booker completed 1-of-6 passes for 22 yards and had one interception in the 2006 A-Day Spring game.
"I love Auburn and have really enjoyed my time here," Booker said. "However, I have decided to attend another school where I will have an opportunity to play sooner. I appreciate the Auburn coaches and fans for their support while I've been at Auburn. I made a lot of great friends and hate to leave, but it's something I have to do."
Booker attended Mays High School in Atlanta where he was a First-Team All-Metro player as a senior after throwing for 1,417 yards and 17 touchdowns while leading his team to an 11-1 mark.
Booker has looked at several schools and is most likely headed to play at hometown Georgia Tech for Coach Chan Gailey. Booker looked at the Yellow Jackets coming out of Mays High in Atlanta before choosing Auburn.