Ratings FAQ

IMDb registered users can give a rating (from 1 to 10) on every released title in the database. Individual ratings are then aggregated and summarized as a single IMDb rating, visible on the title's main page. By "released title" we mean that the movie (or TV series etc.) must have been shown publicly at least once (including festival screening).

Users can update their ratings as often as they'd like, but any new rating on the same title will overwrite the previous one, so it is one rating per title per user.

No. When available, IMDb title pages also include a Metacritic Score for a title, as well as user reviews and links to professional critic reviews from newspapers, magazines and other publications. We aim to offer a variety of opinions on a title so users can make informed viewing decisions. We also always display the breakdown of the ratings, so users can see the distribution of ratings and determine how uniform or polarized the opinion of a title is.

Your Ratings includes your entire ratings history. You can navigate to this page by clicking your name/ID in the upper right hand of the navigation bar at the top of every IMDb page and click "Your Ratings" from the drop down menu. To view your ratings by genre, year, type and more, go to Advanced Title Search and select the options you want to refine by.

By default, titles you rated are listed in chronological order (most recent ones appear first) but you can change the sorting order and select the options by which you want to refine by clicking on the dropdown menu at the top of the list.

The IMDb weighted average does not change upon receipt of each new rating, but instead is updated numerous times per day.

This explains why you may not see any change in the overall rating after submitting your score. 

You can export your ratings history by navigating to the Your Ratings page via your IMDb user profile; and then selecting the "Export" icon from the top right. This will create a .csv file that you can save and adjust as you wish.

We take all the individual ratings given by IMDb registered users and use them to calculate a single rating. We don't use the arithmetic mean (i.e. the sum of all ratings divided by the number of ratings), although we do display the mean and average ratings on the ratings breakdown page; instead the rating displayed on a title's page is a weighted average. To display the detailed ratings breakdown, click the number of ratings located directly below the average IMDb user rating. For an example, see the User rating breakdown for Inside Out.

The IMDb weighted average does not change upon receipt of each new rating, but instead is updated numerous times per day.

A TV series rating is not the weighted average of the ratings of individual episodes. Instead, customers can choose to rate individual episodes separately or give a rating of the series as a whole via the title's series page.

IMDb publishes weighted rating averages rather than raw data averages. The simplest way to explain it is that although we accept and consider all ratings received by users, not all ratings have the same impact (or 'weight') on the final rating. 

When unusual rating activity is detected, a different weighting calculation may be applied in order to preserve the reliability of our system. To ensure our rating mechanism remains effective, we don't disclose the exact method used to generate the rating. 

Yes, your ratings are factored into the aggregate once you have verified your account. To check if your account is verified, if you're on a desktop computer, go to Your Activity page. If you have not verified your account you will see a “Please validate your account” banner at the top of the page and “! Validate your account” in the Profile Checklist on the right of the page.

The rating displayed is correct, as based on the calculations used to generate all ratings for all titles in the database. 

Please remember that the rating is weighted - we don't simply calculate the average by adding up all the ratings and dividing the total by the number of ratings. To prevent abuse and minimize attempts to stuff the ballot (otherwise influence the integrity of the rating system), we don't reveal details about how weighted ratings are calculated other than what is already documented. 

Rest assured, all calculations are applied automatically and there's no human bias in how aggregate ratings are calculated. Statistical considerations aside, there's really no 'right' or 'wrong' rating for a title. 

You can argue that the rating is reductive or too simplistic, and that's a fair point: the IMDb rating aims to distill and aggregate the opinions of millions of IMDb users about a work of artistic expression into a single number from 1 to 10, so obviously some nuances are lost in the process, but we believe that the rewards outweigh the risks. As the #1 movie website in the world with hundreds of millions of monthly visitors, we're in a unique position to offer a real time reflection of fan sentiment.

IMDb ratings are “accurate” in the sense that they are calculated using a consistent, unbiased formula, but we don't claim that IMDb ratings are “accurate” in an absolute qualitative sense. We offer these ratings as a simplified way to see what other IMDb users all over the world think about titles listed on our site.

We believe that these ratings provide a fun and useful indication of the opinion of a title held by the general public, but ultimately each individual is the arbiter of what is 'good' or 'bad' when it comes to judging the value of a work of art.

Think of ratings more as a guide than as an incontrovertible qualitative verdict. In the final analysis, opinions about the quality of movies and TV series are subjective, and the IMDb rating is no exception.

The IMDb rating is only a number. Although it can be useful and informative by itself, there are many other factors which should be considered when trying to evaluate a title, starting with the total number of ratings it received.

A rating derived by the ratings given by hundreds of thousands of users may be more reliable than a rating based on the opinion expressed by a dozen people: larger sample sizes often result in a more representative aggregate rating.

It's also always useful to review ratings in the context of when they were given: popular opinion of a title tends to change over time, in some cases peaking early and in others growing slowly over time.

Everyone watching a movie or series brings their own personal history and tastes, which factor into how a user rates a title. Just because many critics or other IMDb users enjoyed a particular title, does not mean everyone felt the same way. Vice versa, supposedly “bad” titles can receive good ratings, as critical and popular opinion often diverge.

Our weighted average attempts to reduce this effect. The concept of the wisdom of the crowd (i.e. the collective opinion of a large group of individuals rather than of a single expert) comes into play here, which is why we believe all IMDb users should be able to rate as they feel on the 1 - 10 scale.

Our rating system is meant to offer a representation of what IMDb's users think of a movie or series based on their rating. We don't collect or consider published reviews or critics' ratings or any other external factor (although we do offer links to critics' reviews and display a movie's Metascore).

For the purpose of generating the IMDb rating, only ratings given by IMDb users are counted. If a film is rated lower than you'd expect based on published reviews, it means that in that particular case, IMDb users had a different opinion than that movie critics. 

Location information is based on the country / region of residence the user provided when they registered with the site or subsequently designated in Change Your Details, not when they rated.

An example: if a Swiss national registers with IMDb and enters their location as Switzerland, then visits the United States and sees a movie at a festival while in the US and then rates it, the rating will be recorded as coming from a non-US user.

Our standard for allowing users to rate a title is very simple: the title must have been released and/or screened to the public at least once. If a title meets this requirement, we let our registered users rate it.

There is no foolproof way to verify that users have actually seen the title that they are rating, or that the rating that they are giving is what they really think about it. We depend on and expect our users to be truthful and only give ratings for those titles that they have personally seen.

We are aware that there are people who may give a rating for the sole purpose of trying to lower the rating for a title (this happens both ways -- there are just as many people who try to inflate a rating). We have several safeguards in place to automatically detect and defeat this type of ballot stuffing: even though we count and display all unaltered ratings in the rating breakdown, we apply several countermeasures against all attempts to skew the rating and the weighted rating you see displayed on the site already takes all of the above into consideration.

In rare instances, we may notice efforts to influence the user rating for a title via organized mass rating campaigns and other similar tactics. While it's our policy to not remove valid ratings, IMDb already calculates weighted user averages using a mechanism to neutralize the impact of attempts to artificially inflate/deflate a title's rating. 

This mechanism is applied to all titles. In other words, just because the ratings breakdown shows a large number of ratings, it doesn't necessarily mean that those ratings have the same weight. Rest assured that we carefully monitor rating patterns for these titles to determine our best course of action.

It's not uncommon for initial ratings to start high and then go down after a brief period of time. Movies or other titles with a relatively low total number of ratings (less than a hundred) are particularly susceptible to substantial changes in the weighted rating.

When a title only has a few ratings, it doesn't take many more subsequent ratings for the rating to change.

There are several possible explanations for this. First, users are allowed to delete their own rating. So if the rating changes even when the total doesn't, it usually means that some people have deleted their rating while the same number of people have added theirs. Another common explanation is that the weight assigned to ratings given by certain users has changed, so the weighted rating will be affected even when no new ratings have been applied.

Finally, please remember that our rating system is always being improved and the formulas used to calculate ratings (and defeat ballot stuffing) are tweaked regularly -- weighted ratings are frequently recalculated, so when the formula is changed the ratings will also change even without new ratings.

The ratings for an overall series are recorded separately than those for any individual episodes. For example, users can either choose to rate individual episodes or the series overall. The episode ratings are therefore not used in calculating the overall series rating.

For a title to be open for rating and reviews on IMDb, it must have a release date from a public release or screening listed on IMDb. Once released, we do not display a rating until a title has received enough ratings to calculate a weighted user rating. The minimum number of ratings before we display the rating is currently five.

In rare cases we may have an incorrect release date attached to a title, which means that the title may be already available, but still be marked as unreleased and therefore missing a rating. Similarly, the release date might be missing from IMDb entirely. If either of these apply, you can submit a release date addition/correction to the title via the Edit page button listed at the bottom of the title's page.

When a user creates their IMDb account, we detect the country / region of residency. You can change or remove your country / region of residence by visiting Change Your Details (select "-" on the Country menu to remove/opt-out).

Demographic data details (age and gender) were removed and we now include a top 5 country filter and a ratings by episode heat map. The redesign follows ongoing site improvements and reflects changes suggested by IMDb customers, as well as our own in-depth research designed to enhance ratings content, discovery, and navigation.

These lists can be found by navigating to "Movies, TV & Showtimes" in the site navigation menu and then selecting Top 250 Movies (https://www.imdb.com/chart/top) and Top 250 TV Shows (https://www.imdb.com/chart/toptv) from the drop down menu.

Only ratings from regular IMDb users (i.e. people who regularly rate titles on IMDb) are considered when generating the IMDb Top 250 Movies and Top 250 TV Shows lists. In addition to that, a title must have received a minimum amount of ratings (currently 25,000) in order to appear in one of these lists. For details on how these lists are determined, please navigate to the list and scroll to the bottom.

To maintain the effectiveness of the IMDb Top 250 Movies and Top 250 TV Shows lists, we do not disclose the criteria used for an IMDb user to be counted as a regular user in regards to ratings.

Advanced Title Search results for Top 100 and Top 250 movies can be sorted by different attributes (popularity, A-Z, user rating, number of ratings, etc.), and the order in which they are displayed reflects the chosen sorting order and not a movie's rank within the authoritative Top 250 chart, which consists of the Top 250 films as rated by regular IMDb users.

The purpose of this badge is to always know the accurate ranking of a movie within the Top 250 chart, regardless of the sorting option selected in any given Advanced Title Search results page.

The following formula is used to calculate the Top Rated 250 titles. This formula provides a true 'Bayesian estimate', which takes into account the number of ratings each title has received, minimum ratings required to be on the list, and the mean rating for all titles:

weighted rating (WR) = (v ÷ (v+m)) × R + (m ÷ (v+m)) × C

Where:

R = average for the title (mean) = (rating)

v = number of ratings for the title = (ratings)

m = minimum ratings required to be listed in the Top Rated 250 list (currently 25,000)

C = the mean rating across the whole report

Please be aware the Top 250 Movie list only includes feature films: shorts, TV movies, miniseries and documentaries are not included in the Top 250 Movies Chart. The Top 250 TV Shows Chart includes TV Series, but not TV episodes or Movies.

Ratings are set to private by default. You can elect to make your ratings public by clicking your name from the right hand of the home page and select "Your Ratings" from the drop down menu. Click the 3 vertical dots and select "List Settings" from the menu, then select your preferred privacy setting, and click "Save".

However we may at our discretion unilaterally grant you a publicly-viewable badge or other forms of publicly viewable recognition based on the fact that you rated or checked-in for a title (while still withholding showing your rating). For the subset of badges based on completing a rating-based list, if you unrate any or all titles that contributes to gaining the badge, the badge will disappear shortly.

While ratings are based on simple numeric ratings given by users for a title, user reviews are written essays, in which IMDb users explain what they liked or disliked about a title and offer other criticism. Reviews can vary in length from a few lines to several hundred words.

The two are complementary to each other: users can either rate a title or write a review, or do both. Regardless of its content, a review has no effect on the user rating unless the same user has also gave a rating for the title.

IMDb provides the review feature as a forum where users can freely express their opinions about movies or a TV series, as long as they do so in a friendly and civilized manner. As these reviews are user-generated, they do not necessarily reflect the opinions of IMDb or our staff. We do require that users follow our broad guidelines for acceptable content, but we do not impose any special editorial guidance.

As long as reviews comply with those rules, we do not edit or remove them; however, if a review is brought to the attention of our moderators via the “Report” link (located below each one), we may temporarily or permanently suppress it if we determine that it violates our content guidelines or site policies, regardless of whether it expresses a positive or negative opinion.

To present a variety of different viewpoints, user reviews featured on a title page are periodically and frequently rotated. The choice of featured review is automated and is based on these criteria, the most notable being that reviews containing spoilers are excluded from the selection.

Users can also vote on whether they agreed or disagreed with existing reviews, and can sort the display of all reviews for a title based on chronological order, rating, usefulness etc. For an example of review listing for a title (and see all available display options) click here.

A link to the IMDb profile of the author is displayed below each review. This allows you to see how long they've been an IMDb user, how many reviews they've written and other historical data which can help you decide if their opinion usually coincides with yours and can offer useful guidance to assess their critical effectiveness.

See our Why doesn't a title with the average user rating of 9.4 appear in your top 250 Movies or TV list? Help page where we address how ratings are considered when creating the IMDb Top 250 Movies and IMDb Top 250 TV Shows pages.