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Free Flesch-Kincaid Calculator for PDFs & Text

Upload a PDF or paste text to calculate its Flesch-Kincaid Grade Level (FKGL) and see how easy your material is to read.

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Upload your PDF, wait for the text to finish processing, then select Calculate FKGL to see its reading level.

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Your results open in PreguntaBien, ready to review and rewrite.

What is Flesch-Kincaid Grade Level?

FKGL estimates the U.S. school grade level needed to read a text. It uses sentence length and syllables per word to help you judge whether your writing fits your audience.

Aprende sobre las métricas de legibilidad

How is the score calculated?

Nivel de grado = 0.39 x (palabras / oraciones) + 11.8 x (sílabas / palabras) - 15.59

How should I use the result?

Readability evaluators offer a starting point. Your readers’ background knowledge, the subject, and the way you organize information also affect how easy a text is to understand.