GameRankings is a website that collects review scores from both offline and online sources to give an average rating. It indexes over 315,000 articles relating to more than 14,500 games. GameRankings is owned by CBS Interactive. Similar websites include GameStats, Metacritic, MobyGames, and TopTenReviews. GameRankings collects and links to (but does not host) reviews from other websites and magazines and averages specific ones. While hundreds of reviews may get listed, only the ones that GameRankings deems notable are used for the average. Scores are culled from numerous American and European sources. The site uses a percentage grade for all reviews in order to be able to calculate an average, however, because not all sites use the same scoring system (some rate out of 5 or 10, while others use a letter grade), GameRankings changes all other types of scores into percentages using a relatively straightforward conversion process.
Contributions by Agentfred, RockMFR, and Lympathy.