Readability Checker
Good writing is not just correct writing — it is writing your reader can actually understand without effort. A paragraph packed with long sentences and long words may be perfectly grammatical and still lose its reader halfway through, while the same ideas written in short sentences and plain words land immediately. That difference is readability, and it can be measured. This free readability checker scores your text with the two best-known formulas, Flesch Reading Ease and Flesch-Kincaid Grade Level, and shows the word, sentence, and syllable counts behind them, plus an estimated reading time and a plain-English label from Very Easy to Very Confusing. Writers use it to check blog posts, teachers use it to match reading material to a grade level, and businesses use it to make sure instructions, policies, and product pages are clear to real customers. The analysis runs entirely in your browser — your text is never uploaded — and the syllable count is an estimate, because English pronunciation has exceptions no simple rule catches perfectly, but it is close enough to give a reliable score for everyday writing.
Your Readability Results
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Syllable counts are an estimate. All processing is client-side: text never leaves the browser.
How to Use
- Paste or type your text into the box above. The sample sentence "The cat sat on the mat." is already there so you can see a score right away.
- Click Analyse Readability or just keep typing — the score updates live as you edit.
- Read the Flesch Reading Ease score and the plain-English level: 90-100 Very Easy, 80-89 Easy, 70-79 Fairly Easy, 60-69 Standard, 50-59 Fairly Difficult, 30-49 Difficult, 0-29 Very Confusing.
- Check the grade level and the counts to see what is driving the score, then shorten sentences or swap long words for short ones and watch the score improve.
The score comes from just two things: how long your sentences are, and how many syllables your words have. That is why the fastest way to raise a low score is to split long sentences in two, and the second fastest is to replace a long word with a short one — "use" instead of "utilize", "help" instead of "facilitate", "buy" instead of "purchase". Do not chase a perfect score at the cost of meaning, though. A legal contract or a scientific paper will always score lower than a children's story, and that is fine, because its readers expect precise language. The right target depends on your audience: aim for 60 or above and grade 8 or below for a general web audience, and higher still — 70 or above — for instructions, forms, and anything a stressed or hurried reader must understand first time.
Worked Example
Simple sentence: "The cat sat on the mat." — 6 words, 1 sentence, 6 syllables (an estimate: every word here has one syllable). Flesch Reading Ease = 206.835 − 1.015 × (6 words ÷ 1 sentence) − 84.6 × (6 syllables ÷ 6 words) = 116.1, which is above 100 and labelled Very Easy. Flesch-Kincaid Grade Level = 0.39 × 6 + 11.8 × 1 − 15.59 = −1.4, shown as grade 0, meaning the sentence is readable by the youngest readers.
Longer sample: "The sun rises in the east and sets in the west. It gives us light and heat every day. Plants need sunlight to grow, and people need it to stay healthy. When the sky is clear, the sun shines bright, and the day feels warm and calm. Children play outside in the sun, and birds sing in the trees." This paragraph has 59 words, 5 sentences, and 69 syllables (estimate), giving a Flesch Reading Ease score of 95.9, labelled Very Easy, and a grade level of 2.8. Short sentences of about 12 words and mostly one-syllable words keep the score high, which is exactly how plain, readable English behaves: the moment sentences stretch past 20 words or words average two syllables, the score falls quickly into the Standard and Fairly Difficult bands.
Frequently Asked Questions
What is the Flesch Reading Ease score?
The Flesch Reading Ease score rates text from 0 to 100, where higher means easier to read. Scores of 90 to 100 are very easy, 60 to 69 are standard, and scores below 30 are very confusing. It is calculated from average sentence length and average syllables per word.
What is the Flesch-Kincaid Grade Level?
The Flesch-Kincaid Grade Level estimates the US school grade needed to understand a text. A grade level of 8 means an eighth grader should understand it, while a grade level of 12 matches a high school senior.
What is a good readability score?
For most web pages, aim for a Flesch Reading Ease score of 60 to 70, which is standard plain English, and a grade level of 8 or below. Government and health information often targets grade 8, because most adults read comfortably at that level.
How can I make my writing easier to read?
Use short sentences, short everyday words, and one idea per sentence. Break long paragraphs into smaller ones, replace jargon with plain words, and cut any word that does not add meaning.
Is my text private when I use this readability checker?
Yes. This tool runs entirely in your browser and your text is never uploaded, stored, or shared. Syllable counts are an estimate made on your own device, and you can check private drafts without sending them anywhere.