Why Your Writing's Readability Score Matters (Especially for SEO)

Readability scoring isn't about dumbing writing down. It is about matching sentence length and word choice to the people actually reading. A help article written like a legal opinion loses most readers before the second paragraph, however good the information in it. This guide explains what readability formulas measure, what scores to aim for, how readability really relates to search rankings, and practical edits that make writing easier to read without making it simplistic.

What the Flesch Reading Ease score measures

The Flesch Reading Ease formula, created by Rudolf Flesch in 1948, scores text from two things only: average sentence length and average syllables per word.

Score = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words)

Shorter sentences and shorter words push the score up (easier); long sentences full of long words push it down (harder). The formula doesn't judge whether your ideas are good, whether the text is accurate, or even whether it makes sense. It measures how much effort it takes to process the sentences carrying the ideas.

Grade level

The related Flesch–Kincaid Grade Level formula turns the same two measurements into a US school grade: 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59. A grade of 8 means a typical 13–14-year-old could follow it. It is a measure of effort, not of the reader's intelligence. Experts also read faster and more happily when text is plain.

What score to aim for

• Blog posts, help articles and general web content: Flesch 60–70, around grade 7–9. Most newspapers aim here.
• Marketing copy, landing pages and headlines: 70–80 or higher. Short, confident sentences convert better than clever long ones.
• Instructions, forms and anything read under stress (error messages, health and money information): as easy as you can make it.
• Technical, legal and academic writing: lower scores are expected because specialist terms are long, but that is a reason to keep everything around the jargon simple.

How to check your text

1. Open the Readability Checker and paste your text, whether a draft, product page or help article.
2. Read the Flesch Reading Ease score and grade level.
3. Revise the hardest parts and check again until the score suits your audience.

The analysis runs in your browser, so unpublished drafts stay private.

Does readability affect SEO?

Not directly. Google has said it doesn't use readability formulas such as Flesch as a ranking signal, and a high score alone won't move a page up. Be wary of SEO plugins that suggest otherwise.

The effect is indirect, and real. Google's ranking systems aim to reward content that people find helpful and satisfying. A page that is a slog gets abandoned, skimmed without being understood, and rarely linked to or shared. Clear writing gets read, answers the question, and earns links. Plain writing also tends to be better structured: short paragraphs and descriptive headings make it easier for both readers and search engines to see what a page covers, and to quote it in answers and snippets.

So treat the score as a writing tool, not an SEO trick: write for the reader, and search performance tends to follow.

Edits that improve readability fastest

• Split long sentences. Anything over 25 words is a candidate. Look for "and", "which" and "because" mid-sentence; they often mark where one sentence can become two.
• Swap long words for short ones. "Use" for "utilise", "help" for "facilitate", "start" for "commence", "about" for "approximately", "so" for "consequently".
• Prefer active voice. "We reviewed the contract" is shorter and clearer than "The contract was reviewed by us". The Grammar Checker flags passive voice.
• Cut filler. "In order to" becomes "to"; "due to the fact that" becomes "because"; "at this point in time" becomes "now".
• Lead with the point. Put the answer in the first sentence of a paragraph and the explanation after it.
• Use lists for steps, options and anything readers will scan.
• Explain necessary jargon once, in plain words, the first time you use it.

A before-and-after example

Before: "In order to facilitate the expeditious processing of your reimbursement request, it is necessary that all supporting documentation be submitted in a consolidated format prior to the conclusion of the current accounting period." That is one 33-word sentence of long words, and it scores as very difficult.

After: "To get your refund quickly, send all your receipts as one file before the end of the month." That is 18 words, says the same thing, and any reader gets it on the first pass.

Limits of readability formulas

• They count syllables and sentence length, not meaning. A short sentence of nonsense scores very well.
• They can be gamed by chopping sentences into fragments, which reads worse.
• They were designed for English prose and don't work for code, lists of numbers or other languages.
• Specialist terms that your audience knows well, such as "photosynthesis" for biology students, lower the score without making the text harder for them.

Use the score to spot passages that need attention, then judge the edit by reading it aloud. If it sounds like something a knowledgeable person would say, you have got it right.

Frequently asked questions

What is a good Flesch Reading Ease score for a blog?

60–70 suits most general audiences. Technical blogs for specialists can sit lower; consumer blogs can go higher.

Will simpler writing seem less professional?

No. Clear writing reads as confident and competent. Government style guides in the UK and US require plain language for exactly that reason.

Should every text aim for the easiest score?

No. Match the reader. Padding expert material to make it look simpler wastes their time.

Which other tools help with editing?

The Word Counter tracks length and sentence counts, and the Grammar Checker finds passive voice and errors.