"Transformers : Dark of the Moon" is rated PG 13 because of 'intense prolonged sequences of sci-fi action violence , mayhem and destruction , and for language , some sexuality and innuendo' . Source Film Ratings . com
Most likely PG13. I mean look at the rating of 1 and 2!
3 stars
Transformers 2 has been rated as a 3 star movie
Transformers - 1984 Webworld 3-16 is rated/received certificates of: Australia:G
Transformers - 1984 Chaos 3-7 is rated/received certificates of: Australia:G
Transformers - 1984 Ghost in the Machine 3-17 is rated/received certificates of: Australia:G
Transformers - 1984 Fight or Flee 3-15 is rated/received certificates of: Australia:G
Transformers - 1984 Thief in the Night 3-10 is rated/received certificates of: Australia:G
Transformers - 1984 Only Human 3-23 is rated/received certificates of: Australia:G
Transformers - 1984 Call of the Primitives 3-26 is rated/received certificates of: Australia:G
Transformers - 1984 Dinobot Island I 2-3 is rated/received certificates of: Australia:G
Transformers - 1984 Madman's Paradise 3-13 is rated/received certificates of: Australia:G
Transformers - 1984 Starscream's Ghost 3-9 is rated/received certificates of: Australia:G