***UPDATED: Highlight some text, then click the icon in the extension bar to see Flesch-Kincaid Grade Level. This extension shows you the Flesch-Kincaid Grade Level for any web page. The results tell you how many years of formal education a reader theoretically needs to understand a text. For example, a 6.3 would correspond to Grade 6 in the United States. For more information on the algorithim, see here - https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests#Flesch.E2.80.93Kincaid_grade_level
You can Follow the below Step By Step procedure to install the CraftyLevel Chrome Extension to your Chrome Web browser.
It is the CraftyLevel Chrome extension download link you can download and install Chrome Browser.
Broadcast any URL to computers within earshot.
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Given a body of text receive a score on how readable that text is based on the flesch-kincaid readability index.
This extension allows the user's text to be displayed on screen on top of a web page in large type
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Text Readability AnalYzer tool