Readability Checker

What does this readability checker measure?

This readability checker estimates how easy a text will feel to a reader from two measurable signals: words per sentence and syllables per word. As sentences get shorter and words get simpler, the score goes up. The tool runs the analysis in your browser as you type, and it applies each language its own formula: Flesch Reading Ease for English, Ateşman for Turkish and Amstad for German.

The panel has four layers:

• Score and band: a 0 to 100 score plus its label on the formula's own scale.
• Calculation line: the formula with your numbers plugged in, so you see exactly where the score comes from.
• Six counts: words, sentences, syllables, characters and the two formula inputs.
• Longest sentences: a short list that tells you where to start editing.

I use it as the last check before publishing. On the sites my team and I support through SEO consulting, we first write service pages and articles for the reader. Then we look at the score to find the sentences that will tire people out. Your text never leaves your browser and disappears when you close the page.

Why does each language need its own readability formula?

Because languages pack meaning into words differently. Turkish, for example, adds suffixes to a stem, so its words carry more syllables than English ones. Flesch punishes syllables per word with a weight of 84.6. As a result, the English formula makes Turkish text look far harder than it really is, and the reverse also holds.

You can see the effect in the tool itself. The English shipping note in the examples table scores 83 with Flesch. Switch to Türkçe (Ateşman) and the same text scores 100, since the Turkish formula expects long words and treats short English ones as trivially easy. Same text, wrong ruler.

That is why researchers rebuilt the formula per language:

• Ateşman (1997) kept Flesch's two inputs and recalculated the weights on Turkish texts of varying difficulty.
• Amstad (1978) adjusted Flesch for German, where long compound nouns push syllables per word up.

The tool therefore checks the language of your text. If it does not match the selected formula, a warning appears in the panel and one click switches you over. In practice this matters most on multilingual sites, where one team often edits all language versions with the same habits.

What is a good Flesch reading ease score?

For general web copy, aim for 60 or above. In Flesch's own interpretation table, 60 to 69 is the Standard band, often called plain English, and it maps to roughly 8th or 9th grade in US schools. Above 70 the text reads as fairly easy or easier.

Still, set the target by audience rather than by habit. These are the starting ranges I use in my own work; they come from practice, not from a rule:

• Product, service and contact pages: 70 or above. The reader is deciding, not studying.
• Blog posts and guides: 60 or above. A technical topic lowers the score a little, which is fine as long as you explain the terms.
• Contracts, privacy policies and technical docs: the score will be low by nature. Add a plain summary or a short Q and A instead of forcing the legal text.

Accessibility points the same way. The W3C's WCAG 3.1.5 Reading Level criterion asks for a simpler version or supplemental content when text needs more than lower secondary reading ability. It sits at level AAA, so it is not a hard minimum. That said, it is a good compass if you write for a broad audience. I cover the rest in my guide to web accessibility and WCAG.

Does a readability score affect Google rankings?

There is no evidence that it does directly. Google's content documentation never mentions a readability score as a ranking signal. Instead, Google's helpful content guidance lists questions to ask yourself, such as whether the content has spelling or stylistic issues and whether it looks well produced or hastily put together.

The same page also says plainly that Google has no preferred word count. In short, Google cares about what the reader experiences, not about a formula. Readability plays an indirect role there:

• A reader who understands the text finishes it and finds the answer they came for.
• Short, clear sentences stay easy to follow on a phone screen, so readers keep their place.
• An easy service page also shortens the path to the contact form.

So I treat the score as a signal of reader experience rather than an SEO target. When I plan content, I first settle search intent, heading structure and scope; readability is the final polish. I walk through that whole process in how to write SEO friendly content.

How do you raise a low readability score?

The fastest way is to change the two inputs the formula reads: shorten sentences and simplify words. This is the order I follow:

1. Split the longest sentence first. Click the top row of the list in the panel and the tool selects that sentence. Then break it at its conjunctions into two or three sentences.
2. Give each sentence one idea. If a sentence holds a problem, a fix and a result, separate all three.
3. Pick the shorter word. For example, use instead of utilise, and help instead of facilitate.
4. Prefer the active voice. Write we check the page rather than the page is checked by us; it is shorter and says who acts.
5. Explain terms where they first appear. You do not have to delete jargon; a short definition next to it is enough.
6. Read the text aloud. Where you run out of breath is where the sentence needs a full stop.

For sentence length I use 20 words as my threshold, which is why the tool marks sentences over 20 words in orange. The GOV.UK style guidance is a little looser: it advises splitting sentences over 25 words. I cover microcopy and button text separately in my UX writing guide.

When can a readability checker mislead you?

A formula only measures length; it cannot see meaning, logic or accuracy. Even a nonsense paragraph built from short words can score well. So always confirm the score by reading the text. Be especially careful in these cases:

• Very short texts: Flesch designed his test for samples of about 100 words. In a text of a few sentences, one sentence swings the score a lot.
• Bullet lists and headings: the tool treats every line break as the end of a sentence. Short bullets lower the average sentence length and lift the score.
• Numbers, abbreviations and names: the tool counts a word made only of digits as 1 syllable, and it counts a Turkish brand name by English rules if English is selected.
• Code and URLs: links and code snippets distort the counts; remove them before you measure.

Also keep in mind that English syllable counting is an estimate. Words like "area" or "business" trip up any rule based on vowel groups, so two tools rarely agree to the exact point. Therefore compare before and after with the same tool and the same formula, never across tools.

How I use the readability checker alongside other content tools

A single score shows only one side of a text. When I prepare a page for publishing, I run four tools in a row:

1. Length: first, the word counter shows me the scope of the text and its reading time.
2. Topic focus: next, the keyword density tool confirms the main phrase runs naturally through the copy.
3. Readability: then this readability checker helps me find and split the longest sentences until the score sits in the target band.
4. Search result: finally, I test the title and description in the Google SERP preview.

The order matters. If you polish sentences before you fix scope and topic, the effort may go to waste, because every paragraph you add later moves the score again. Decide what you want to say first, then refine how you say it.