The Flesch-Kincaid Grade Level (FKGL) is a measure of how difficult a text is to read. It is calculated using a formula that takes into account the average number of words per sentence and the average number of syllables per word.
An FKGL of 14 means that the text is written at a level that is appropriate for a 14-year-old. This means that the text is likely to be easy for a 14-year-old to read and understand.