Calhoun was drafted by the Los Angeles Angels of Anaheim in the eighth round of the 2010 Major League Baseball draft. He was assigned to Rookie League Orem, where in 56 games, he hit .292 with 7 HR and 42 RBI. He played 2011 with High-A Inland Empire, where in 133 games, he hit .324 with 22 HR, 99 RBI and a .957 OPS. He also stole 20 bases. He was named to the California League Postseason All-Star team as a utility player. He was the Kenny Myers Minor League Player of the Year in 2011. This monster season earned him a direct promotion to Triple-A Salt Lake to begin 2012. In 43 games prior to his first callup, he hit .296 with 5 HR and 31 RBI.

On May 21, 2012, Calhoun was recalled by the Angels to replace Vernon Wells, who was placed on the disabled list. He made his debut the next day, and he recorded his first major league hit the day after, a double off of Jarrod Parker. Calhoun was the 8th player from the 2010 MLB draft to make his major-league debut. He was sent back down on June 12 after 8 games with the Angels. He made the Pacific Coast League All-Star team. He had another short stint with the Angels before being called up for good on August . His final stats with the Bees in 105 games were .298 with 14 HR, 73 RBI, and a .877 OPS. He was used exclusively off the bench in August and September. In 21 games with the Angels, he hit .174 with 1 RBI in just 23 at-bats.

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