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Flesch–Kincaid readability scores

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When i was posting something, one of my SEO tools told me – “your article scores bad on Flesch-Kincaid reading-ease test”. I had never heard of that and got curious – turned out hat this is very big.

This test was invented by two people (guest who by the name of the test) that were commissioned by the military to invent a standard test for manual reading difficulty assessment. It grew beyond that. The test shows how easily readable a material is. The higher score the easier to read. Scores are 0-100.

Score Notes
90.0–100.0 easily understood by an average 11-year-old student
60.0–70.0 easily understood by 13- to 15-year-old students
0.0–30.0 best understood by university graduates

src: Wikipedia

Now the test is used all over the place – some companies are even obliged to produce reading materials that have particular score. And they are obliged by law. Such an example is the insurance industry – the life insurance policies should score 45 and above. Ain’t that something?

For the most curious here is the formula:

Flesch–Kincaid readability formula



To be honest, the coefficients seem like magic to me but i guest there is good reason for them to be exactly 206.835, 1.105 and 84.6.

How understandable do you write?