Free Readability Checker — Flesch-Kincaid & More

Paste your text and get instant readability metrics. Flesch Reading Ease, grade level, sentence length, vocabulary diversity — all calculated in your browser.

1

Paste your text

Write or paste a journal entry, essay, or any text. The tool works best with at least a few sentences.

2

Get instant scores

See Flesch Reading Ease (0–100 scale), Flesch-Kincaid Grade Level, Gunning Fog Index, and more — calculated instantly, no waiting.

3

Understand your style

See your average sentence length, word length, and vocabulary diversity. Learn where your writing falls on the readability spectrum.

Benefits

Four readability formulas

Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, and Coleman-Liau Index — industry-standard metrics used by writers, editors, and educators.

Deterministic scores

Same text, same score, every time. No AI variability — pure math. You can trust the results and compare across drafts.

Completely private

Everything runs in your browser. Your text is never sent to any server. No APIs, no tracking, no data collection.

Pensio analyzes not just how you write — but what you feel.

Inside Pensio, every journal entry is analyzed for emotional patterns. See how your writing evolves over weeks and months — readability is just the beginning.

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Frequently Asked Questions

What is Flesch Reading Ease?
A score from 0 to 100 measuring how easy your text is to read. Higher scores mean easier reading. 60–70 is standard (8th–9th grade), 30–50 is college level, and 0–30 is graduate level.
What is the Flesch-Kincaid Grade Level?
The U.S. school grade level needed to understand your text. A score of 8.0 means an 8th grader could read it comfortably. Most popular writing targets grades 6–8.
Are the scores deterministic?
Yes. Same text produces the same scores every time. These are mathematical formulas based on sentence length and syllable count — not AI. Results are reproducible and trustworthy.
How many syllables does a word need to be "complex"?
In the Gunning Fog Index, complex words have 3 or more syllables. The Flesch formulas use average syllables per word across the entire text.
Can I use this for journal writing?
Absolutely. Journal writing tends to be more conversational and readable — typically scoring 60–80 on Flesch Reading Ease. Check your entries to understand your natural writing style.

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