Career
Calvert-Lewin joined the Youth Academy of Sheffield United on 28 April 2005. In early April 2015, he signed a new long term deal to keep him at Bramall Lane until summer 2018. He made his professional début for the senior team on 25 April 2015, in a 1-1 draw away at Leyton Orient as a 66th-minute substitute.
On 7 August 2015, Calvert-Lewin joined Northampton Town on loan until January.