Readability of the Web: A study on 1 billion web pages

We have performed a readability study on more than 1 billion web pages. The Automated Readability Index was used to determine the average grade level required to easily comprehend a website. Some of the results are that a 16-year-old can easily understand 50% of the web and an 18-year old can easily understand 77% of the web. This information can be used in a search engine to lter websites that are likely to be incomprehensible for younger users.