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Readability
Checker

Paste any text and instantly get your Flesch Reading Ease score, Flesch-Kincaid Grade Level, and full writing stats — calculated in pure PHP with zero API calls.

Flesch Reading Ease Grade level Unlimited — always free
Flesch Reading Ease
72.4
Fairly Easy
8.2
FK Grade
247
Words
14
Sentences
17.6
Avg words/sent
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Analyzing readability…

Computing Flesch scores, syllables, and sentence stats
Flesch Reading Ease
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Flesch-Kincaid Grade
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Run analysis to see grade
📊 Flesch Score Reference
90–100 Very Easy 5th grade — very simple, conversational
80–90 Easy 6th grade — plain English, easily read
70–80 Fairly Easy 7th grade — most adults read comfortably
60–70 Standard 8th–9th grade — plain English standard
50–60 Fairly Difficult 10th–12th grade — high school level
30–50 Difficult College — academic / professional writing
0–30 Very Confusing Graduate — technical / scientific papers
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Words
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Sentences
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Syllables
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Avg Words / Sent.
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Avg Syllables / Word
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Understanding Readability Scores

The Flesch formulas have been the industry standard since 1948, used by governments, publishers, and educators worldwide.

The Flesch Formula

Flesch Reading Ease = 206.835 − (1.015 × avg words/sentence) − (84.6 × avg syllables/word). Scores 60–70 are ideal for most web content and general audiences.

Flesch-Kincaid Grade

FK Grade = (0.39 × avg words/sentence) + (11.8 × avg syllables/word) − 15.59. This translates your text's complexity into a US school grade level. Grade 8 is the gold standard for web content.

How to Improve

The two fastest wins: shorten your sentences (aim for under 20 words each) and replace multi-syllable words with simpler synonyms. Both directly improve your Flesch score and keep readers engaged.