Flesch Reading Ease Score Calculator

Formula

To calculate the Flesch Reading Ease Score (\(FRES\)):

\[ FRES = 206.835 - (1.015 \cdot ASL) - (84.6 \cdot ASW) \]

Where:

\(FRES\) is the Flesch Reading Ease Score
\(ASL\) is the average sentence length (the number of words divided by the number of sentences)
\(ASW\) is the average number of syllables per word (the number of syllables divided by the number of words)

What is the Flesch Index?

The Flesch Index, also known as the Flesch Reading Ease Score, is a tool used to assess the readability of an English text. It uses a mathematical formula to calculate a score based on the average number of syllables per word and the average number of words per sentence. The resulting score ranges from 0 to 100, with a higher score indicating easier readability. This index is commonly used in the fields of education and journalism to ensure written materials are appropriate for the intended audience’s reading ability.

Example Calculation 1

Let's assume the following values:

Average Sentence Length (\(ASL\)) = 15
Average Syllables per Word (\(ASW\)) = 1.5

Using the formula:

\[ FRES = 206.835 - (1.015 \cdot 15) - (84.6 \cdot 1.5) = 206.835 - 15.225 - 126.9 = 64.71 \]

The Flesch Reading Ease Score is 64.71.

Example Calculation 2

Let's assume the following values:

Average Sentence Length (\(ASL\)) = 20
Average Syllables per Word (\(ASW\)) = 1.2

Using the formula:

\[ FRES = 206.835 - (1.015 \cdot 20) - (84.6 \cdot 1.2) = 206.835 - 20.3 - 101.52 = 85.02 \]

The Flesch Reading Ease Score is 85.02.