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Readability Score

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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Readability Score -

Tag(s) : Text Processing

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Readability Score

Text Readability Tester

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)









See also: Word Counter

Answers to Questions (FAQ)

What is a readability test?

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

How to interpret Flesch–Kincaid readability grade level (FKGL)?

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
11st grade
22nd grade
33rd grade
44th grade
55th grade
66th grade
77th grade
88th grade
99th grade
1010th grade
1111th grade
1212th grade
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)

How to interpret SMOG grade?

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

dCode retains ownership of the online 'Readability Score' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'Readability Score' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Readability Score' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'Readability Score' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

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Questions / Comments

Thanks to your feedback and relevant comments, dCode has developed the best 'Readability Score' tool, so feel free to write! Thank you!


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