This free online readability checker scores your writing using the Flesch Reading Ease formula — the most widely used readability test in English — and shows your US grade level alongside word count, sentence count, and average words per sentence. Paste any text into this readability checker tool and the score updates instantly. Use it to check reading level of text before publishing, to simplify dense drafts, or to verify that your content is accessible to your target audience.

At Arb Digital, readability is part of our content production checklist for every client page we write. The Flesch score gives us an objective signal when a draft needs simplifying — something experienced editors catch instinctively but that this readability checker quantifies in seconds for anyone.

What Is the Flesch Reading Ease Score?

The Flesch Reading Ease test — developed by Rudolf Flesch and validated across decades of research — measures how easy a piece of English text is to read. As the Flesch–Kincaid readability tests Wikipedia article explains, the formula calculates a score from 0 to 100 based on two factors: average sentence length and average number of syllables per word. Higher scores mean easier reading; lower scores mean more complex text.

The flesch reading ease checker score ranges interpreted by this tool:

• 90–100 — Very easy. Understood by average 11-year-olds. Suitable for general consumer content.
• 70–89 — Easy to fairly easy. Conversational, accessible to most adults.
• 60–69 — Standard. Comfortable for most teenagers and adults. The target for most web content.
• 30–59 — Fairly difficult to difficult. Suited to college-educated readers.
• 0–29 — Very difficult. Suited to specialists and academics.

For most general web content, a score of 60 or above is the goal. This check readability of text benchmark keeps writing welcoming to the broadest possible audience without oversimplifying your ideas.

Reading Level Checker — Understanding Grade Level

Alongside the Flesch score, this reading level checker shows the approximate US grade level your text requires — calculated using the Flesch-Kincaid Grade Level formula. A grade level of 8 means roughly an eighth-grade education (around 13–14 years old) is needed to read the text comfortably. Counter-intuitively, a lower grade level is almost always better for general content — even highly educated readers prefer and absorb clear, simple writing faster.

The check reading level of text result from this tool is the same calculation used by Microsoft Word’s readability statistics feature and professional editing tools. According to the US Federal Plain Language Guidelines — the government standard for public-facing communication — most documents aimed at a general audience should target an 8th-grade reading level or below. Major publishers, including most newspapers and consumer magazines, deliberately write at this level or lower.

How This Readability Checker Tool Calculates Your Score

The Flesch Reading Ease formula applied by this online readability checker is:

Score = 206.835 − (1.015 × average words per sentence) − (84.6 × average syllables per word)

The word readability checker and sentence readability checker functions built into this tool count words by matching letter-number groups, count sentences by detecting sentence-ending punctuation, and estimate syllables using a vowel-cluster algorithm. This produces accurate results for standard English prose — the same approach used by academic and professional readability tools. The accompanying grade level uses the Flesch-Kincaid Grade Level formula: Grade = (0.39 × average words per sentence) + (11.8 × average syllables per word) − 15.59.

Readability Score vs Grammarly — How Do They Compare?

Grammarly readability score is one of the most-searched readability benchmarks because Grammarly is widely used for writing assistance. The readability grammarly function uses the Flesch-Kincaid formula — the same formula this tool uses — making the scores directly comparable. The grammarly readability score shown in Grammarly’s interface measures the same two factors (sentence length and word complexity) and produces the same 0–100 Flesch Reading Ease result.

The practical difference is context: Grammarly integrates readability scoring into a full grammar and style checking workflow, while this free readability checker is a standalone tool you can use with any text from any source — not just text written in Grammarly. Many writers use this check readability score online approach to assess content they’ve drafted elsewhere, published content they want to review, or competitor pages they want to benchmark against.

Readability and SEO — The Connection

While Google does not use Flesch scores as a direct ranking signal, readability affects SEO meaningfully through user behaviour. Nielsen Norman Group’s landmark research on how users read on the web found that users scan rather than read most web content — and clear, well-structured writing with short sentences dramatically improves how much content is actually consumed. Longer time-on-page, lower bounce rates, and more page-depth engagement all signal quality to search algorithms.

Google’s Helpful Content guidance emphasises writing for people, not search engines — and content written for people is almost always more readable. Further Nielsen Norman research on writing for lower-literacy users shows that simpler writing serves all users better, not just those with lower literacy — even experts read clearer content faster with better comprehension. And Plain Language’s elements of clear writing confirm the same principle across decades of communication research: clarity is not a compromise — it is the goal.

Use this essay readability checker and web page readability test to review published content, not just drafts. Improving the readability of existing pages often improves engagement metrics without any other changes. Pair this tool with our keyword density checker for a complete on-page content audit, and our word counter for length analysis. Browse all content tools at our free tools hub.

Practical Ways to Improve Your Readability Score

• Shorten sentences. Aim for an average of 15–20 words per sentence. Split long sentences at conjunctions — “and”, “but”, “because” are natural split points.
• Choose simpler words. Prefer “use” over “utilise”, “help” over “facilitate”, “show” over “demonstrate”. Plain words communicate faster and more clearly.
• Use active voice. “We tested the tool” reads faster and cleaner than “The tool was tested by us.” Active constructions almost always score better.
• Remove filler words. Cut “very”, “really”, “in order to”, “it should be noted that” — they add syllables and sentence length with no added meaning.
• Break text into shorter paragraphs. Paragraph length affects perceived readability even though it does not appear in the Flesch formula — shorter paragraphs reduce reader fatigue.
• Read aloud. Any sentence you stumble over when reading aloud is a candidate for simplification. The ear catches problems the eye misses.

Frequently Asked Questions