Paste your text to get its Flesch Reading Ease score and the grade level needed to understand it, calculated live with five trusted formulas — Flesch–Kincaid, Gunning Fog, SMOG and ARI alongside Reading Ease. See the sentence, word and syllable stats behind the scores. 100% in your browser — nothing is uploaded or stored.
🔒 Everything runs in your browser. Your text is never uploaded, logged or stored.
The Text Readability Scorer tells you how easy your writing is to understand, in seconds. Paste any text and it calculates the Flesch Reading Ease score — a 0 to 100 scale where higher means easier — along with the school grade level a reader needs to follow it, using five established formulas: Flesch–Kincaid Grade, Gunning Fog, SMOG, and the Automated Readability Index. Behind the scores it shows the raw ingredients — sentence length, word count, syllable totals and complex words — so you can see exactly what is making your text hard or easy.
It is part of the SERP & Content Analysis group in our free SEO Toolkit. Pair it with the Word Count & Reading Time Analyzer to size your content, the Keyword Density Analyzer to balance terms, the Heading Structure Checker to organise it into scannable sections, and the Title Tag Length Checker and Meta Description Length Checker to refine what shows in search. Everything runs in your browser — your text is never uploaded or stored.
Trusted readability metrics, instantly.
A clear 0–100 score with a plain-language verdict.
Flesch–Kincaid, Gunning Fog, SMOG and ARI side by side.
See sentence length, syllables and complex-word counts.
All scoring happens in your browser — nothing leaves your device.
From draft to a clear readability grade.
A few sentences or a whole article.
Reading Ease and a plain verdict appear.
Check five formulas at once.
Shorten sentences until it reads easily.
What each score band means for your readers.
A text readability scorer estimates how hard a piece of writing is to read, expressed as a score or a school grade level. It does not judge whether your ideas are good — it measures the mechanics that affect comprehension, chiefly how long your sentences are and how many syllables your words contain. Long sentences and multi-syllable words demand more from a reader; short sentences and familiar words are easier to follow. By turning these mechanics into a number, a readability scorer gives you fast, objective feedback on whether your text matches the audience you are writing for. This tool is part of the SERP & Content Analysis group in the SEO Toolkit.
Each formula weighs sentence length and word complexity slightly differently, which is why seeing several together is more reliable than trusting one. The Flesch Reading Ease gives a 0–100 score where higher is easier — most web writing aims for 60 or above. Flesch–Kincaid Grade converts that into a US school grade. The Gunning Fog Index emphasises complex words of three or more syllables. The SMOG Index is widely used for health and safety material because it predicts the grade needed for full comprehension. The Automated Readability Index uses characters per word instead of syllables, giving an independent cross-check.
0–100 scale; aim for 60+ for a general audience.
Three grade formulas show the schooling a reader needs.
ARI cross-checks using word length, not syllables.
Trusted where full comprehension really matters.
Search engines reward content that satisfies readers, and readers stay longer on pages they can follow easily. Clear, well-paced writing reduces bounce, increases time on page, and makes your message accessible to a wider audience — including the many people reading on phones, in a second language, or in a hurry. Readability is not a direct ranking signal you can game, but it underpins the engagement signals that do matter, and it is central to writing the genuinely helpful content that search engines aim to surface. Aiming for plain English rarely means dumbing down; it usually means clearer thinking.
Syllables are estimated with a heuristic that counts vowel groups and adjusts for common patterns like silent trailing e and vowel hiatus. No browser-based tool can be perfect here — English spelling is irregular — so a few unusual words will be off by one. Because the formulas average over many words, these small errors have little effect on the overall scores, but treat individual figures as close estimates.
Each formula weighs sentence length and word difficulty differently and was calibrated on different material, so a spread of one or two grades between them is normal and expected. That spread is useful: when all five point the same way, you can be confident; when they diverge, it often signals unusual text, such as lots of short fragments or a few very long sentences.
Readability formulas are statistical, so they are most reliable on a paragraph or more. The SMOG Index in particular was designed for samples of around thirty sentences and is approximated for shorter text here. A single sentence can be scored but should be read as indicative only; aim for at least a few full sentences for a dependable result.
No. All parsing, syllable counting and formula calculation run entirely in your browser with JavaScript, and the tool never makes a network request with your text. Nothing you paste is uploaded, logged or stored, so it is safe for drafts, confidential documents and client work.
Aim for plain English so the widest audience can follow.
Check that important information is genuinely understandable.
Match reading material to a student's grade level.
Keep landing pages clear, scannable and persuasive.
Use the Text Readability Scorer with these tools from the SEO Toolkit: size content with the Word Count & Reading Time Analyzer, balance terms with the Keyword Density Analyzer, organise sections with the Heading Structure Checker, perfect the search-visible parts with the Title Tag Length Checker and Meta Description Length Checker, keep writing original with the Duplicate Content Checker, and preview the result with the SERP Snippet Preview.
Anyone who wants to be understood.
Everything about readability scoring.
It measures how easy your writing is to understand. Paste any text and it calculates the Flesch Reading Ease score plus four grade-level formulas — Flesch–Kincaid, Gunning Fog, SMOG and the Automated Readability Index — and shows the sentence, word and syllable statistics behind them, all updating live as you edit.
Yes, completely. There is no cost, no sign-up and no limit on how much text you score. The tool runs entirely in your browser, so there are no server costs and nothing to pay for.
For general web content, aim for 60 or above, which corresponds to plain English readable by most 13- to 15-year-olds. Scores of 70 to 80 are comfortable for a broad audience, while scores below 50 read at college level and below 30 are very difficult. The ideal target depends on who you are writing for.
Flesch Reading Ease is a 0 to 100 scale where higher means easier. Grade-level formulas like Flesch–Kincaid instead give a US school grade — the years of education a reader needs to follow the text. They measure the same underlying difficulty from two angles, which is why a high ease score pairs with a low grade.
Each formula weighs sentence length and word complexity differently and was calibrated on different material, so a spread of one or two grades is normal. Seeing several together is more reliable than one: when they agree, you can trust the result, and when they diverge it often flags unusual text such as many fragments or a few very long sentences.
Syllables are estimated with a heuristic that counts vowel groups and adjusts for patterns like silent trailing e and vowel hiatus. Because English spelling is irregular, no in-browser counter is perfect and a few unusual words may be off by one. The formulas average over many words, so these small errors barely affect the overall scores.
Readability formulas are statistical and most reliable on a paragraph or more. The SMOG Index was designed for samples of about thirty sentences and is approximated for shorter text here. A single sentence can be scored but is only indicative; aim for at least a few full sentences for a dependable result.
Not as a direct ranking factor, but it strongly supports the engagement signals that do matter. Clear, well-paced writing keeps readers on the page, reduces bounce and reaches a wider audience, which aligns with the helpful, satisfying content search engines aim to reward. Writing for clarity is good for both readers and rankings.
No. All parsing, syllable counting and formula calculation run entirely in your browser with JavaScript, and the tool never sends your text over the network. Nothing you paste is uploaded, logged or stored, so it is safe for drafts, confidential documents and client work.
Shorten long sentences, break them into two where you can, and replace multi-syllable words with simpler alternatives. Use active voice, cut filler, and add headings and short paragraphs to give the eye rest. Re-score after each pass and watch the grade level fall and the Reading Ease score rise.
Yes. The scorer is fully responsive, so you can paste text and read every score from a phone or tablet. The Reading Ease gauge, the grade-level cards and the statistics all display and scroll cleanly on small screens just as they do on desktop.
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Get a Flesch Reading Ease score, four grade-level formulas and the stats behind them — so you know whether your writing is clear or needs simplifying. Free, private and instant in your browser.
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