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Tool to calculate the score of the readability tests of a text (character of a written text easy to read and understand for each age group)

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Tag(s) : Text Processing

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The measurement tool can only handle text based on the Latin alphabet and its variants (so especially the characters A-Z and numbers 0-9)

The definition of a readability test is any form of assessment of the readability (easy to read) of a text, a book, a novel, a message, a story, a article.

In practice, this is usually a score that is used to associate a writing with the minimum recommended age for reading it.

To calculate the score, 4 values are often used to characterize the text:

$C$ the number of characters

$S$ the number of syllables

$W$ the number of words

$W_3$ the number of words with 3 or more syllables (polysyllabic word)

$X$ the number of sentences

The notion of number of syllables can be ambiguous because of various pronunciations.

Example: dCode is an awesome site contains 20 characters, 10 syllables, 5 words (including 1 with 3 syllables or more) and 1 sentence.

How to interpret Flesch read-ease score (FRES)?

The formula for calculating the Flesch readability score is $FRES = 206.835-1.015\frac{W}{X}-84.6\frac{S}{W}$

The calculated value is usually between 0 and 100.

 100 to 90 Very easy to read (for all, aged 10 and +) 90 to 80 Easy to read 80 to 70 Fairly easy to read 70 to 60 Plain English, Understandable 60 to 50 Fairly difficult to read 50 to 30 Difficult to read 30 to 0 Very difficult to read

Formula similar to the Flesch score, it has been reworked to correspond to Anglo-Saxon school levels (depending on the number of years of study): $FKGL = 0.39\frac{W}{X}+11.8\frac{S}{W}-15.59$

ScoreScholar level
13-14Bachelor
15+Master/PhD

How to interpret Automated Readability Index?

The Automated Readability Index is calculated $ARI = 4.71 \frac{C}{W} + 0.5\frac{W}{X}-21.43$

The returned value corresponds to the level of studies necessary to read the text (see above FKGL)

The SMOG level (for Simple Measure of Gobbledygook) is calculated $SMOG = 1.043 \sqrt{ \frac{ 30 \times S_3 } {X} } + 3.1291$

The returned value corresponds to the level of studies necessary to read the text (see above FKGL)

How to interpret Coleman–Liau index?

The Coleman – Liau index is calculated $CLI = 5.88 \frac{C}{W} - 2.96\frac{X}{W} - 15.8$

The returned value corresponds to the level of studies necessary to read the text (see above FKGL)

How to interpret Gunning Fog index?

The Gunning Fog index is calculated $GFI = 0.4 \left( \frac{W}{X} + 100 \frac{S_3}{W} \right)$

The returned value corresponds to the level of studies necessary to read the text (see above FKGL)

Source code

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