This service calculates both the Flesch Reading Ease Score and the Flesch-Kincaid Grade Level.
Both standards can be used to specify the readability of your web pages.
Flesch Reading Ease Score
Flesch Reading Ease = 206.835 - (1.015 * (total words / total sentences)) - (84.6 * (total syllables / total words))
The Flesch Reading Ease scales from 0 to 100, with 30 being "difficult" and 70 being "fairly easy".
Note: Web page text should be around the 60 to 80 mark on this scale.
Flesch-Kincaid Grade Level
Flesch-Kincaid Grade Level = (.39 * (total words / total sentences)) + (11.8 * (total syllables / total words)) - 15.59
The Flesch-Kincaid Grade Level translates the 0-100 Flesch Reading Ease score to a U.S. grade level.
For example, a score of 7.2 would indicate that the text is expected to be understandable by an average student in the 7th grade.
Note: Web page text should be around the 7 to 9 mark on this scale.