The Flesch-Kincaid readability tests are tools used to assess the readability of English texts. They help determine how easy or difficult a piece of writing is to understand based on sentence length and word complexity. The tests produce scores that indicate the education level required to comprehend the text. There are two main formulas: the Flesch Reading Ease score and the Flesch-Kincaid Grade Level. The Reading Ease score ranges from 0 to 100, with higher scores indicating easier readability. The Grade Level score corresponds to U.S. school grades, showing the minimum education level needed to understand the text.