A film's rating is a label assigned by an industry-run board, not a government agency. The board watches the finished movie and slots it into one of five categories — G, PG, PG-13, R, or NC-17 — based on content such as violence, language, nudity, sexuality, and drug use. Alongside the letter, the board attaches short content descriptors, the phrases that explain why the film earned its rating.
The ratings matter to viewers for a simple reason: they are the only standardized preview of what a movie contains. And they matter to studios for a commercial reason — a rating shapes who can buy a ticket, which theaters book the film, and how widely it can play. This explainer covers who assigns ratings, what each category means, how to read the descriptors, and what the label changes for a film's distribution.
Who assigns film ratings, and is it the government?
In the United States, ratings come from the Classification and Ratings Administration, known as CARA, which operates under the Motion Picture Association, the major studios' trade group. The process is voluntary. No law requires a film to be rated, and unrated films exist — many documentaries, foreign titles, and festival releases skip the process entirely. For related coverage, see What Is a Film Festival Circuit? How Movies Travel from Sundance to Cannes.
The board is made up of parents whose job is to judge content the way a concerned parent would, not the way a critic would. Filmmakers submit a finished cut, the board screens it, and the rating plus descriptors come back. If the filmmaker disagrees, there is an appeals process, and cuts can be resubmitted — often edited — for a new look. That back-and-forth is a real negotiation: a director may trim a scene or soften language to move a film from one category to another.
Because the system is industry-run, its judgments reflect the standards the member studios agree to, not statute. Film schools treat the ratings as one lens among many for reading a movie; coursework in programs like Temple University's Film and Media Arts major teaches students analytical tools for examining film, including the cultural and industrial forces that shape what reaches the screen.
What do G, PG, PG-13, R, and NC-17 actually mean?
The five categories describe the audience a film is suited for, in rising order of mature content. Here is the general shape of each, as the board applies it:
- G — General Audiences. Nothing that would offend parents of young children. Language is mild at most; violence, if any, is cartoonish.
- PG — Parental Guidance. Some material may not suit children. Parents are advised to look into it first.
- PG-13 — Parents Strongly Cautioned. Material may be inappropriate for children under 13. This is the category where a single intense scene, a stretch of strong language, or sustained action can tip a film.
- R — Restricted. Viewers under 17 need an accompanying parent or adult guardian. Stronger violence, explicit sexuality, heavy language, or drug use typically lands here.
- NC-17 — Adults Only. No one 17 or under is admitted, accompanied or not. The rating signals content the board deems adult by nature, most often explicit sexuality.
Two things are worth keeping straight. First, the categories judge content, not quality — a mediocre film and a masterpiece can carry the same letter. Second, the boundary lines are judgment calls, not formulas. Two films with similar content can land in different categories because the board weighs context: how a scene is framed, how long it lasts, and what the film as a whole communicates.
How do content descriptors work?
The letter on the poster is only half the label. The descriptors — short phrases such as those flagging violence, language, brief nudity, or drug use — say specifically what the board found. They are printed in advertising and on the film's official listing, and they do more practical work than the letter itself.
A parent choosing between two PG-13 films gets far more from the descriptors than from the shared rating. One film's PG-13 may rest on intense action sequences; another's on a single scene of strong language. The descriptors separate those cases in a way the letter cannot.
Descriptors also reveal the board's reasoning in a way the letter hides. When a film's rating surprises people, the descriptors usually explain it: a film can carry a mild rating with one flagged element that some viewers find harsh, or a restrictive rating built on cumulative content rather than any single scene. Reading the descriptors before buying a ticket is the single most useful habit the rating system offers.
Why does a rating change a film's distribution and reach?
This is where the system stops being informational and starts being commercial. The rating a film receives constrains its audience in concrete ways.
An R rating excludes unaccompanied teenagers, which removes a chunk of the opening-weekend audience for any film courting young viewers. An NC-17 rating is more severe: many large theater chains decline to book NC-17 titles at all, several major advertising outlets restrict them, and some home platforms treat them differently from R-rated fare. For a studio, NC-17 can effectively narrow a release to select arthouse screens — which is why filmmakers often cut a film to avoid the label.
The PG-13 line carries the most money. It is the broadest category that still permits substantial action and intensity, so blockbusters are engineered toward it, and a board decision that pushes a tentpole to R can force reshoots, edits, or a marketing rethink. The rating is not a creative judgment, but it functions as a market gate: it determines which audiences the marketing can legally target and which theaters will take the print.
Streaming complicates the picture without replacing it. Theatrical ratings still matter because most streamers rate their own catalogs with TV-style or platform-specific maturity labels, and a film's theatrical rating follows it into press coverage, licensing, and viewer expectations. How a title travels from theaters to platforms is its own process, covered in our explainer on the theatrical window and how long movies stay in theaters before streaming. This connects to our earlier piece, What Is a Theatrical Window, and How Long Do Movies Stay in Theaters Before Streaming? Explained.
What this means for choosing what to watch
Our analysis of how the system works in practice: treat the letter as a rough filter and the descriptors as the real information. The letter tells you the access rules — who can buy a ticket, what a platform will show by default. The descriptors tell you what is actually in the film.
A few practical steps:
- Check the descriptors before deciding for a child; two films with the same letter can differ sharply in content.
- Remember that ratings judge content, not craft — the label says nothing about whether a film is good.
- For unrated films, which are common on the festival and documentary circuit — see our guide to how movies travel from Sundance to Cannes — look to the platform's own maturity label and trusted named critics instead.
The rating system's limits are as real as its uses. It is one industry's parental judgment, applied by a small board, and reasonable people disagree with its calls regularly. It does not measure artistic merit, and it says nothing about themes a film handles well versus badly. What it does reliably provide is a standardized, printed summary of content — and, for the studios, a gate that decides how many screens a film can reach. Knowing both halves of that is what makes the label useful.
