ToolNexIn
Home SEO Tools Readability Checker

Readability Checker - Flesch-Kincaid, Grade Level & More

Paste any text and get instant Flesch Reading Ease score, grade level, reading time, passive voice detection, sentence complexity flags, word frequency analysis, benchmark comparison, and actionable tips. Everything updates live as you type.

Always Free Live as you type Flesch-Kincaid + 8 metrics Runs in browser
FK Score · Grade Level · Reading Time · Passive Voice · Word Freq
Live score gauge updates as you type - no button needed
Flags overly long sentences and passive voice inline
Benchmarks your text against NYT, Wikipedia, Twitter, and academic writing
Try a sample:
0 words · 0 sentences · 0 characters
📊
Paste text above to see your readability score

What makes it different

Other readability tools give you a score.
This tells you exactly how to improve it.

Live gauge, sentence flags, passive voice meter, word frequency, benchmark comparison, and specific tips - not just a number.

Live animated gauge

The Flesch Reading Ease gauge updates in real time as you type - watch your score move as you simplify sentences or replace long words.

instant visual feedback

Sentence-by-sentence flags

Every sentence is scanned and colour-coded - amber for long sentences, red for very long, blue for passive voice. Fix exactly what needs fixing.

precise, not vague

Word frequency heatmap

See which words you overuse. High frequency of the same word signals repetition - a key readability signal that pure formula scores miss.

beyond the formula

Benchmark comparison

See how your text compares to Twitter posts, Wikipedia articles, New York Times writing, and academic papers - understand where you sit instantly.

real context

Specific improvement tips

Not just "simplify your writing" - actual tips based on your specific metrics: which sentences to shorten, your passive voice percentage, and vocabulary advice.

actionable, not generic

Three reading speed times

Reading time at slow (150 wpm), average (200 wpm), and fast (300 wpm) - because technical content is read differently to marketing copy.

audience-aware

Quick guide

Analyse and improve your text in 3 steps

1

Paste your text

Type or paste any content. All metrics update live - score, grade level, reading time, and sentence analysis.

2

Read the flags

Check which sentences are flagged as too long or passive. See your score on the readability scale and compare to benchmarks.

3

Apply the tips

Follow the specific improvement suggestions. Edit the text and watch your Flesch score rise on the live gauge.

Readability - why it matters more than you think

Readability is not about dumbing down your writing. It is about respecting your reader's time. The most successful communicators - from Barack Obama's speechwriters to Apple's product team - write at a lower grade level than their audience is capable of reading. This is intentional. Easier text is processed faster, retained better, and persuades more effectively.

The Flesch-Kincaid formula explained

The Flesch Reading Ease score uses two variables: average sentence length (ASL) and average number of syllables per word (ASW). The formula is: 206.835 − (1.015 × ASL) − (84.6 × ASW). Both longer sentences and longer words reduce your score. The easiest way to improve it is to break long sentences in two and replace multi-syllable words with shorter synonyms.

The grade level paradox. Most US adults read comfortably at a 7th-8th grade level - even those with university degrees. This is not a failure of education; it is a feature of how the brain processes text under typical reading conditions (skimming, distraction, time pressure). The New York Times writes at approximately grade 10. Most successful blog posts and marketing copy target grade 6-8. Targeting grade 12+ actively reduces comprehension and engagement for general audiences.

Flesch Reading Ease score guide

ScoreDescriptionTypical audience
90–100Very easy5th grade, children's books
70–90Easy6th grade, popular novels, conversations
60–70Standard7th-8th grade, most websites, news
50–60Fairly difficult10th-12th grade, professional writing
30–50DifficultCollege level, technical documentation
0–30Very difficultAcademic papers, legal writing

How to improve your readability score

The two highest-impact changes are: break long sentences (anything over 20 words) into two shorter sentences, and replace multi-syllable words with shorter alternatives where possible. "Utilise" becomes "use". "Subsequently" becomes "then". "Demonstrate" becomes "show". These changes reduce your average syllables per word, which has the largest coefficient in the Flesch formula.

Pairs well with

Related free tools

Word Counter

Count words, characters, sentences and reading time

Text Difference Checker

Compare two texts and highlight differences

Case Converter

Convert text to any case format instantly

Domain Age Checker

Check domain registration and age

FAQ

Readability questions,
answered.

Ask a question
The Flesch Reading Ease score rates text from 0 to 100. Higher scores mean easier to read. A score of 70-80 is easy for most adults. Below 30 is very difficult, suitable for academic or legal text.
The Flesch-Kincaid Grade Level converts readability into a US school grade equivalent. A score of 8 means an 8th grader can understand the text. Most websites aim for grade 6-8.
For general web content, aim for Flesch Reading Ease 60-70 (grade 8-10). For blogs and marketing, 70-80 is ideal. Academic writing typically scores 30-50.
Word count divided by reading speed. Slow = 150 wpm, average = 200 wpm, fast = 300 wpm. Technical content is typically read at the slower end.
Passive voice is when the subject receives the action rather than performing it. "The report was written by John" (passive) vs "John wrote the report" (active). Most style guides recommend keeping passive voice below 10% of sentences.
The two highest-impact changes: break sentences over 20 words into two shorter ones, and replace long words with shorter alternatives. "Utilise" becomes "use", "subsequently" becomes "then", "demonstrate" becomes "show".