Calum Dyson first joined Everton at the age of six. A tall, strong striker, he was a near ever-present for the title-winning Under-18s in 2013/14. His six goals and 10 assists were vital as the Blues progressed to an end of season final against Manchester City, while Dyson also found himself involved with the Under-21s, making six appearances. Calum then became a regular for David Unsworth's Under-21s and later Under-23s side, with his first taste of senior football coming on loan at Stockport County and Chester in 2015/16.
He started the 2016/17 campaign in fine form and, despite spending the second half of the season on loan at League Two outfit Grimsby Town, finished joint top scorer with eight goals as the young Blues lifted the Premier League 2 title. He also impressed during his stint in Lincolnshire and was named Grimsby's Young Player of the Season for 2016/17. In June 2018 it was announced that Calum had signed a new contract with League One side Plymouth Argyle. Calum has been a regular scorer for the reserves in the Central and Peninsula Leagues, and has featured only twice for the first team, as a substitute in Checkatrade Trophy ties at home to Swindon and at Newport County. In January 2019 Calum signed on loan with Stevenage until the end of the season.