Work out reading level (flesch kincaid) instantly with clear inputs, formula shown and shareable results.
Flesch-Kincaid grade level is 0.39 x average sentence length plus 11.8 x average syllables per word minus 15.59, and reading ease uses the same two averages on a 0-100 scale. Both formulas rest on only two levers, sentence length and word length, so shortening sentences is usually the quickest way to bring a passage down a grade.
Grade level
FKGL = 0.39 x (words / sentences) + 11.8 x (syllables / words) - 15.59
Reading ease
FRE = 206.835 - 1.015 x (words / sentences) - 84.6 x (syllables / words)
FKGL = 0.39 x (words / sentences) + 11.8 x (syllables / words) - 15.59. Flesch-Kincaid grade level is 0.39 x average sentence length plus 11.8 x average syllables per word minus 15.59, and reading ease uses the same two averages on a 0-100 scale.
Both formulas rest on only two levers, sentence length and word length, so shortening sentences is usually the quickest way to bring a passage down a grade.
Enter total words, total sentences, total syllables. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.