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Consider the following scenario: If I write the text below it gives me an expected Grade 3, but if I write just "Congratulations!" it gives me an unexpected Grade 42 (16+):

~/readability/ $ ./readability
Text: Congratulations! Today is your day. You're off to Great Places! You're off and away!
Letters: 65
Words: 14
Sentences: 4
3.042857
Grade 3

~/readability/ $ ./readability
Text: Congratulations!
Letters: 15
Words: 1
Sentences: 1
42.799999
Grade 16+

enter image description here

P.S. Check50 is all green smileys: enter image description here

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  • As they say, do the math. The answer is arithmetically correct. The input, however, is not the intended "target". From this article "Coleman said he created the formula as one of the many ways to help the U.S. Office of Education calibrate the readability of all textbooks for the public school system.".
    – DinoCoderSaurus
    Commented Oct 21, 2021 at 19:36
  • 42.8 is the correct result. The test is obviously not designed to give accurate results from just a single word. From the above article posted by DinoCoderSaurus: "Note: Although we used just 100 words for the sample above, you should input at least 300 words of text to calculate a more accurate grade score."
    – Lyra
    Commented Jan 20, 2022 at 13:00

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