How to Improve Your Website's Readability Score

Summary: To improve your website's readability score, use shorter sentences (under 20 words), break paragraphs into 2-4 sentences, add subheadings every 200-300 words, replace jargon with plain language, and use bullet points to present complex information. A Flesch-Kincaid Reading Ease score of 60-70 (roughly Grade 8 level) is ideal for most web content, and improving readability directly increases dwell time, reduces bounce rates, and makes your content more likely to be cited by Google's AI Overviews.

Readability is the measure of how easy your content is to read and understand. It affects not just user experience but also SEO — Google's ranking systems increasingly favour content that humans actually engage with. If your bounce rate is high and your time-on-page is low, readability is often the hidden culprit.

According to the National Literacy Trust, the average adult reads at an 8th-grade level. Yet most business websites write at a 12th-grade level or higher. That gap between how you write and how your audience reads is where you lose visitors — and rankings.

What Is a Readability Score?

A readability score is a numeric assessment of how easy text is to read, typically calculated using formulas like:

These formulas analyse three main factors:

A well-readable webpage doesn't mean dumbed-down content. It means content engineered so readers absorb information with minimal effort — which is what both humans and search engines reward.

Why Readability Matters for SEO

Readability isn't just a nice-to-have — it directly impacts your search performance in multiple ways:

How to Check Your Readability Score

Clarity SEO's free Readability tool analyses your page content and gives you a clear readability score with specific recommendations for improvement.

→ Check your readability score with Clarity SEO

The full SEO Report Card also surfaces readability signals as part of its content quality checks.

→ Get your free SEO Report Card

Other readability checking tools include:

How to Improve Your Readability Score

The 7 Core Readability Principles

Improving readability is about content structure as much as word choice. Here's a practical checklist:

1. Break up long sentences.

The biggest readability killer is sentence length. Research by the American Press Institute found that sentences of 8 words are understood by 100% of readers, while sentences of 43+ words are understood by fewer than 10%. Aim for an average of 15-20 words per sentence.

Before:

"In order to facilitate the optimisation of your website's search engine performance metrics, it is necessary to implement a comprehensive content strategy that takes into account the readability and comprehension levels of your target audience demographic."

After:

"To improve your SEO, you need content your audience can actually read. Start with simple sentences. Keep most under 20 words."

2. Use short paragraphs.

Aim for 2–4 sentences per paragraph online. White space is not wasted space — it gives readers' eyes somewhere to rest. On mobile devices, a paragraph that's 5 sentences long on desktop can fill the entire screen, making readers feel overwhelmed. The Nielsen Norman Group recommends keeping paragraphs under 100 words for web content.

3. Use subheadings (H2, H3) every 200–300 words.

Subheadings let scanners find what they're looking for without reading every line. Most people scan before they read. Structure for scanners. Subheadings also serve as signals to Google about the topical structure of your content — they're used in generating featured snippets and AI Overview citations.

<h2>How to Improve Readability</h2> <p>...</p> <h3>Step 1: Shorten Your Sentences</h3> <p>...</p> <h3>Step 2: Use Active Voice</h3> <p>...</p>

4. Prefer active voice over passive voice.

Active voice is shorter, clearer, and more direct. Aim for no more than 10-15% passive voice in your content. Yoast SEO's readability panel specifically flags this metric.

5. Replace jargon with plain language.

Every industry has jargon that excludes outsiders. Use the simplest word that's accurate. "Use" instead of "utilise". "Help" instead of "facilitate". "Buy" instead of "purchase". The UK government's digital service team found that using simpler language reduced support calls by 75% and increased task completion rates.

6. Use bullet points and numbered lists.

Lists are one of the most powerful readability tools on the web. They:

7. Add visual hierarchy with formatting.

Use bold to highlight key terms. Use code blocks for technical snippets. Use callout boxes (blockquotes) for important notes. Visual variety keeps readers engaged and helps them find the information they need quickly.

Advanced Readability Techniques

Use transition words: Words like "however", "therefore", "for example", and "in addition" help readers follow your logic. Yoast SEO recommends that at least 30% of your sentences contain transition words. These words act as signposts, telling readers how each sentence connects to the last.

Front-load important information: The most important information should come first — in your article, in each section, and in each paragraph. This follows the "inverted pyramid" style used in journalism. Readers who scan (which is most of them) will still get your key points.

Use the "one idea per paragraph" rule: Each paragraph should communicate a single concept. If you find yourself using "also" or "additionally" within a paragraph, consider splitting it into two.

Vary sentence length: While short sentences are easier to read, a page of only 5-word sentences feels choppy and robotic. Mix short punchy sentences with slightly longer ones for a natural rhythm. The variation itself keeps readers engaged.

Write like you talk: Read your content out loud. If you stumble, your readers will too. Conversational writing scores higher on readability indexes and feels more engaging. The best web content sounds like a knowledgeable friend explaining something, not a textbook.

For WordPress

With Yoast SEO:

Yoast includes a built-in readability analysis panel (green, orange, red ratings) that checks:

With Rank Math:

Rank Math includes a similar content analysis tool with readability indicators in the editor sidebar.

Content editor tips:

For Shopify

Shopify's native editor has no built-in readability tools. Write in a dedicated editor first:

For blog posts: Shopify's blog editor supports basic formatting. Use subheadings (H2, H3) via the Format dropdown. Product descriptions are often the worst readability offenders — long, jargon-filled paragraphs that could be replaced with bullet points highlighting key features and benefits.

For Wix / Squarespace / Webflow

Wix: No native readability scoring. Write content externally in Hemingway or Google Docs, then paste. Wix's editor supports paragraph formatting, bullet lists, and headings — use them liberally.

Squarespace: Same approach. Squarespace's block-based editor makes it easy to break content into short, structured sections. Use text blocks, list blocks, and spacer blocks together.

Webflow: No native readability tool. Webflow's CMS is powerful for structured content — use Collection fields for structured data and the rich text field for formatted article body. Write in Hemingway first.

Readability Benchmarks by Industry

Different industries have different readability standards. Here's what the top-performing sites in each sector typically score:

If your content scores above Grade 10 and you're targeting a general audience, you're likely losing readers and rankings to competitors who write more simply.

How Readability Connects to Other SEO Factors

Readability doesn't exist in isolation — it's intertwined with many other aspects of SEO:

Common Mistakes to Avoid

Readability Formulas Explained

Understanding the differences between readability formulas helps you choose the right benchmark for your content. Each formula measures slightly different things and can give different scores for the same text.

Flesch-Kincaid Reading Ease

The most widely used readability formula. Scores 0–100, where higher = easier to read. The formula weighs average sentence length and average syllables per word. A score of 60–70 suits most web content. This is the formula used by Yoast SEO, Microsoft Word, and most online readability tools.

Score interpretation:

Gunning Fog Index

The Fog Index emphasises polysyllabic words (words with 3+ syllables) and sentence length. It outputs a US grade level, so a Fog Index of 12 means the text requires 12th-grade education to understand. For web content, aim for a Fog Index of 8–10.

When Fog Index is most useful: It catches "foggy" writing better than Flesch-Kincaid — text that uses lots of multi-syllable jargon even if sentences are short. If your Flesch score looks fine but readers still struggle, check your Fog Index. It may reveal hidden complexity in word choice.

Coleman-Liau Index

Unlike Flesch-Kincaid and Gunning Fog, the Coleman-Liau Index uses character count instead of syllable count. This makes it faster to compute and less dependent on pronunciation rules (useful for non-English text). It also outputs a US grade level.

When to use it: For automated analysis of large content sets, Coleman-Liau is more reliable because counting characters is deterministic (no guessing syllable boundaries). It tends to rate technical content as slightly harder than Flesch-Kincaid does, because technical terms have more characters per word.

Which Formula Should You Use?

For most website owners, Flesch-Kincaid Reading Ease is the best default — it's the most widely understood, built into the most tools, and Google's own documentation references it. Use Gunning Fog as a secondary check for jargon-heavy content. Use Coleman-Liau for batch analysis of large sites.

The key insight: don't obsess over any single formula. If your content scores well on any two of these three, it's readable enough. The real test is always human — read it out loud and see if it flows naturally.

Readability and Voice Search

Voice search has fundamentally changed how people interact with search engines, and readability is at the heart of it. When someone asks Siri, Alexa, or Google Assistant a question, the spoken answer needs to be immediately understood — there's no time to re-read or scan.

Why simpler content ranks better for voice:

Practical tips for voice search optimization:

Tools for Checking Readability

The right tool depends on your workflow. Here are the best options for different situations:

Clarity SEO Readability Tool

Clarity's readability analyzer checks your live page — not just pasted text — which means it evaluates the actual reading experience including headers, lists, and formatting. It scores based on Flesch-Kincaid and provides specific, actionable recommendations. No signup required.

Hemingway Editor

The best tool for writing and editing in real time. Hemingway colour-codes your text: yellow for hard-to-read sentences, red for very hard, purple for complex words that have simpler alternatives, blue for adverbs, and green for passive voice. It gives you a grade level score and makes it visual and intuitive to fix issues as you write.

Best for: Writers who want real-time feedback during the drafting process. Available as a free web app and a paid desktop app ($19.99 one-time).

Grammarly

Grammarly goes beyond readability to check grammar, spelling, tone, and clarity. Its readability score in the Performance panel shows you how your text compares to other content. The Premium plan ($12/month) adds advanced readability suggestions and sentence restructuring.

Best for: Non-native English writers or teams that need grammar checking alongside readability. The browser extension works in real time across all websites, including CMS editors.

Readable.com

Readable provides the most comprehensive readability analysis — Flesch-Kincaid, Gunning Fog, Coleman-Liau, SMOG, Automated Readability Index, and more, all in one report. It also analyses URL readability, email content, and can monitor your entire site over time.

Best for: Content strategists and SEO professionals who need detailed multi-formula analysis and site-wide monitoring.

Writing for Different Audiences

A single readability level doesn't fit all content types. The key is matching your writing complexity to your audience's expectations and reading context.

B2B vs B2C Content

B2C (Business-to-Consumer): Write at Grade 6–8. Your audience includes everyone from students to retirees, scanning on phones while commuting. Shorter sentences, simpler words, more bullet points. Lead with benefits, not features. Product descriptions, service pages, and blog posts should all be immediately accessible.

B2B (Business-to-Business): Write at Grade 8–10. Your readers are professionals but they're still busy and scanning. You can use industry-specific terms (your readers know them), but sentences should still be concise. Whitepapers and technical documentation can go to Grade 10–12, but blog posts and landing pages should stay at 8–10.

Technical vs General Audiences

General audience: Grade 6–8. Assume no prior knowledge. Explain every concept. Use analogies. This is the approach for most marketing content, blog posts, and public-facing pages. A Nielsen Norman Group study found that simplified content increased usability by 124% — more than doubling task completion rates.

Technical audience (developers, engineers, specialists): Grade 10–12. You can use domain-specific terminology without explaining it. Your readers expect precision over simplicity. However, sentence structure should still be clear — complex ideas in complex sentences is a recipe for misunderstanding, even among experts.

Adapting Within a Single Page

The best content adapts its readability level within a single page:

This layered approach satisfies both casual scanners and deep readers — exactly what Google's helpful content guidelines reward. For more on structuring content for both humans and search engines, see our guides on writing title tags, keyword research, image optimization, SEO scoring, and website speed.

FAQ

Q: What is a good readability score for a website?

For most websites, a Flesch-Kincaid Reading Ease score of 60–70 is ideal — roughly equivalent to Grade 8 reading level. Content for technical or professional audiences may score lower, but general web content should be accessible to a broad audience. The most shared and linked-to content on the web typically scores between 55 and 70 on the Flesch-Kincaid scale.

Q: Does readability directly affect Google rankings?

Readability is not a direct ranking signal (Google has confirmed they don't use Flesch-Kincaid scores), but it strongly affects engagement metrics that do influence rankings: dwell time, bounce rate, and pogo-sticking. Content that is easy to read keeps users on the page longer, which signals quality to Google. Practically speaking, improving readability almost always improves rankings indirectly.

Q: What is the Flesch-Kincaid Reading Ease score?

The Flesch-Kincaid Reading Ease formula scores text on a scale of 0–100. Higher scores mean easier reading. A score of 60–70 is suitable for most general audiences. Scores below 30 are considered very difficult, typically appropriate only for academic papers. The formula considers average sentence length and average number of syllables per word. For context, the average Hemingway novel scores around 65, while academic papers average around 25-30.

Q: How long should paragraphs be on a website?

Web paragraphs should generally be 2–4 sentences or under 100 words. Longer paragraphs work in academic or print contexts but cause high drop-off rates on websites, especially on mobile devices where screen real estate is limited. One-sentence paragraphs are perfectly acceptable on the web — they create emphasis and breathing room.

Q: Can I improve readability without rewriting everything?

Yes. Start with the biggest wins: add subheadings every 200–300 words, break long paragraphs in two, convert run-on sentences into bullet points. These structural changes can dramatically improve readability without rewriting the core content. You can often improve a page's readability score by a full grade level just through formatting changes alone — no rewrites needed.

Q: Should I use the same readability level for all pages?

Not necessarily. Your homepage and main landing pages should target the broadest audience (Grade 6-8). Blog posts and guides can be slightly more complex (Grade 8-10). Technical documentation for developers can go higher (Grade 10-12). The key is matching readability to your audience's expectations for each specific page type. Consider who is searching for the content and adjust accordingly.

Summary

Readability isn't a soft metric — it's a measurable factor in how long people stay on your page, how much of your content they absorb, and how likely Google is to surface your content as a featured snippet or AI citation. With 79% of web users scanning rather than reading, your content must be structured for both skimmers and deep readers. Short sentences, clear structure, active voice, and frequent subheadings go further than any keyword strategy.

Check your readability score now and see exactly what to improve.

→ Get your free SEO Report Card