In the United States, The Motion Picture Association of America rates all films.
Usually 5 stars to rate a movie but IMDB.COM uses a 10 star rating other sites might be similar.
Internet Content Rating Associations (ICRA)
Entertainment Software Rating Board
The M rating is reserved for video games, and is not used in movies.
Entertainment Software Rating Board(ESRB)
There are several Pixar movies that have a PG rating such as The Incredibles, Up, and Brave.
The saw movies are rated R
Yes, I agree with Movie ratings. It helps you pick what movies are best. And what movies suck.
The Movies - 1925 is rated/received certificates of: USA:TV-G (TV rating)
Best 10 Colour movies ever - toprater.com/en/movies/rating/criteria/colour/filters
Rodgers and Hammerstein The Sound of Movies - 1996 TV is rated/received certificates of: Australia:G (video rating) UK:U (video rating)
ESRB and PEGI