The comic version of Transformers Sizes are different from Michael Bay's Transformers Franchise. Even Unicron is far larger and Cybertron is about the size of planet Saturn. Scale in Transformers is inconsistent to put it mildly. There are times however outside and inside of lore when official heights and sizes of characters are given. Here is a list of said sizes of Autobots.
Sources: http://www.tfw2005.com/boards/threads/aoe-scale-chart-thread.966670/
