Reading Ease and Grade Level

Understanding Readability

A section of your Email Metrics calculates the estimated time it will take to read your message.

Reading ease and grade level

PoliteMail also uses Word tools to calculate readability scores using the Flesch Reading Ease and Flesch-Kincaid Grade Level tests. These tests base their scores on the average number of syllables per word and words per sentence.

The Reading Ease test uses a 100-point scale, with a higher score indicating that it is easier to understand the message. The formula for the Reading Ease score is:

206.835 – (1.015 x ASL) – (84.6 x ASW)

ASL is the average sentence length and ASW is the average number of syllables per word.

The Grade Level test rates text based on a U.S. school grade level. For example, a score of 9 indicates that a ninth grader can understand the document. The formula for the Grade Level score is:

(.39 x ASL) + (11.8 x ASW) – 15.59