MG3 係一款五門五座位揭背小車。以混能版為例，車身長 4,113 mm、闊 1,797 mm、高 1,502 mm，軸距 2,570 mm。尺碼同主要對手 Mazda 2 接近，但後座空間表現更佳，乘坐感更舒適。
The MG3 is a 5-door, 5-seat hatchback. For the Hybrid+ version, the dimensions are 4,113 mm in length, 1,797 mm in width, and 1,502 mm in height, with a wheelbase of 2,570 mm. The size is similar to its main rival, the Mazda 2, but the MG3 offers better rear seat space and comfort.
