In Detective Conan SDB 30+ (Super Digest Book) in the section titled "118 Questions for Gosho Aoyama," Gosho Aoyama explicitly mentioned that Shinichi Kudo's height is 174cm and emphasized that this measurement matches his own height. However, the enigmatic Conan's height also has official data: In 2006, during an interview at the Erlangen International Comic Salon in Germany, Gosho Aoyama was once again asked about Conan's height. The interview record describes him gesturing with his hand, indicating an approximate height of around 130cm.

Apart from the protagonist, Shinichi Kudo, the height of the Phantom Thief Kaito Kid (Kaito Kuroba) is also 174cm, identical to creator Gosho Aoyama's height. These two rivals, not only resembling each other facially but also sharing the same height, might explain why even Ran, Shinichi's childhood friend, can mistake one for the other. While Hattori Heiji's height hasn't been officially disclosed, it's generally believed to be similar to the other two.