Porter began his career at the Officer Kangaroos in the South East Juniors competition.[4] He played for the Gippsland Power for 2 seasons in 2016 and 2017.[5] He served as vice-captain and claimed the club's best-and-fairest medal in 2017, and finished seventh in the best-and-fairest count for the TAC Cup that year.[6][7] He also played one game for the Casey Demons during the 2017 VFL season.[1]
AFL
Porter made his AFL debut in the Western Bulldogs' close win against the Gold Coast Suns in the eighth round of the 2020 AFL season.[8][9][10] Porter had 9 disposals and laid 4 tackles in his first game.[11] However, Porter suffered a minor shoulder injury and was taken out of the team for the next round.[12]
Porter was delisted by the Western Bulldogs at the conclusion of the 2020 AFL season, after just 1 game for the club over his three years at the club.[13][14]
VFL
After being delisted, Porter joined the Box Hill Hawks in the VFL. He made his debut for the Hawks in round 1 of the 2021 VFL season against Casey, and played a total of seven games that season.[15]
In 2022, he played 19 games, including a career-best 45 disposals in round 18 against the Northern Bullants.[15][16] He won the club's best-and-fairest medal, the Col Austen Trophy.[17]
In 2023, Porter was appointed co-captain of the Hawks, serving alongside Hugh Beasley.[18] After Beasley retired at the end of the 2023 season, Porter was appointed sole captain for the 2024.[19] He is contacted to Box Hill until the end of 2025.[20]
^The 2020 season was played with 17 home-and-away matches per team (down from 22) and 16-minute quarters with time on (down from 20-minute quarters with time on) due to the impact of the COVID-19 pandemic.
^"Callum Porter". Aussie Rules Draft Central. Retrieved 28 July 2020.
^Bennett, Russell (31 October 2017). "Callum's relentless pursuit". Pakenham Gazette. Archived from the original on 13 July 2024. Retrieved 13 July 2024. It's a quality – a competitive edge – that sets him apart and has the outgoing Gippsland Power vice-captain on the verge of AFL draft selection.
^Peter-Budge, Sean (22 September 2022). "2022 Col Austen Recap". Box Hill Hawks. Archived from the original on 14 March 2023. Retrieved 13 July 2024.
^Peter-Budge, Sean (10 March 2023). "Beasley, Porter and Horner to Lead VFL side in 2023". Box Hill Hawks. Archived from the original on 6 May 2023. Retrieved 13 July 2024. Hugh Beasley, the Hawks' skipper last term, will share captaincy duties with reigning Col Austen Trophy winner Cal Porter
^"✍️ the captain re-commits!". Twitter. Box Hill Hawks. 28 July 2024. Archived from the original on 28 July 2024. Retrieved 28 July 2024. Cal Porter has signed on for a fifth season in brown and gold.