How to Rewrite for Better Readability Scores

Q: What is a good readability score?

For the Flesch Reading Ease scale (0–100): 60–70 is plain English suitable for general audiences; 70–80 is easy, suitable for teenagers and up; 80–90 is very easy, suitable for 11-year-olds. For Flesch-Kincaid Grade Level: Grade 8 is the target for most general content. For Gunning Fog: below 12 for general audiences. The 'right' score depends on your audience — healthcare patient materials target Grade 6; legal contracts may intentionally be Grade 16+.

Q: How do I improve my Flesch Reading Ease score?

Flesch Reading Ease is based on two factors: average sentence length and average syllable count per word. To improve it: shorten sentences (split any sentence over 25 words), replace multi-syllable words with shorter synonyms where meaning isn't lost, and use active voice (passive voice typically adds syllables and length). Every sentence under 15 words with common vocabulary pushes the score up.

Q: Does a better readability score mean better writing?

Not necessarily. Readability scores measure one dimension: how effortlessly text can be processed. They don't measure accuracy, depth, originality, persuasiveness, or appropriateness for the specific audience. A legal contract intentionally uses precise formal language that scores poorly on readability metrics. A children's book scores extremely well. The goal is to score appropriately for your audience, not to maximize readability score universally.

Q: What tools measure readability?

Common readability tools: Microsoft Word (Review > Check Accessibility > Reading Level shows Flesch-Kincaid), Hemingway App (hemingwayapp.com, highlights complex sentences and passive voice), Readable.com, Grammarly (includes readability score in premium), and the Yoast SEO plugin (shows readability score in WordPress). Most calculate multiple metrics simultaneously — Flesch Reading Ease, FKGL, and Gunning Fog are the most commonly reported.

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Quick Answer

Readability scores are driven by two main factors: sentence length and word complexity (syllable count). To improve them: split sentences over 20 words, replace multi-syllable words with shorter equivalents, and convert passive voice to active. AI rewriting tools can apply all three patterns simultaneously — but always review for meaning retention after simplification.

📋 Table of Contents

Quick Answer
The Major Readability Metrics
The Two Levers That Control Most Readability Scores
Additional Readability Factors Beyond the Scores
Target Readability Scores by Content Type
Using AI for Readability Improvements
Frequently Asked Questions

📋 Table of Contents

Quick Answer
The Major Readability Metrics
The Two Levers That Control Most Readability Scores
Additional Readability Factors Beyond the Scores
Target Readability Scores by Content Type
Using AI for Readability Improvements
Frequently Asked Questions

Readability scores quantify what readers feel intuitively: some text flows easily; other text requires effort. When writing regularly scores below target ranges, it means readers are working harder than necessary to extract your meaning — and some will give up before they finish.

Understanding what readability scores actually measure helps you improve them deliberately, rather than randomly shortening sentences and hoping for the best.

The Major Readability Metrics

Metric	What It Measures	Target Range (General Audience)
Flesch Reading Ease	Scale 0–100. Combines avg sentence length + avg syllables/word. Higher = easier.	60–70 (plain English)
Flesch-Kincaid Grade Level	US school grade required to understand. Lower = more accessible.	Grade 6–8 for general content
Gunning Fog Index	Years of formal education required. Based on sentence length + % complex words (3+ syllables).	Below 12 for general audiences
SMOG Grade	Based on polysyllabic words in 30 sentences. Common for healthcare.	Grade 6 for patient materials
Coleman-Liau Index	Based on characters per word and sentences per 100 words.	Grade 8 for most web content

All of these metrics are approximations — they measure proxies for reading difficulty (sentence length, word length) rather than comprehension directly. But they're useful because the proxies correlate with actual reader effort in broad patterns.

The Two Levers That Control Most Readability Scores

Lever 1: Sentence Length

Average sentence length is the strongest predictor across most readability formulas. Sentences over 25–30 words force readers to hold multiple clauses in working memory simultaneously. Short sentences release that cognitive load.

The target: average sentence length of 15–20 words for general content. This doesn't mean every sentence should be 15 words — variety is actually better for engagement. It means your longest sentences should be rare, and your average should stay in range.

To shorten sentences: Find the word "and" and the word "which" — these often connect two thoughts that work better separated. "The team reviewed the proposal and identified three major issues which required escalation" → "The team reviewed the proposal and found three major issues. All three required escalation."

Lever 2: Word Complexity (Syllable Count)

Long words slow reading down. Every additional syllable adds processing time. Replacing a 4-syllable word with a 1-syllable word makes text faster to read — as long as the meaning remains the same.

The principle: use the shortest word that accurately conveys the meaning. If "use" works, don't write "use." If "start" works, don't write "initiate." If "show" works, don't write "demonstrate."

Before — Poor readability score (Flesch ~28, Grade Level ~16)

The implementation of comprehensive organizational restructuring initiatives necessitates the simultaneous consideration of multidimensional stakeholder perspectives and operational continuity requirements, which collectively contribute to the complexity of the transformation process.

After — Improved score (Flesch ~65, Grade Level ~8)

Restructuring a large organization is complex. You need to weigh the impact on all stakeholders while keeping the business running. Both goals pull in different directions, which makes the process harder.

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Additional Readability Factors Beyond the Scores

Readability formulas don't capture everything that affects how easy text is to read. These factors matter but aren't in the formulas:

White space and paragraph length: Long unbroken paragraphs are hard to read regardless of sentence length. Keep paragraphs to 3–5 sentences for web content.
Heading structure: Headers give readers navigation landmarks. Well-structured heading hierarchies improve comprehension even when the sentence-level readability score is the same.
Lists vs. Prose: Converting a list of items embedded in a sentence into an actual bulleted list improves readability dramatically without changing a single word's syllables.
Font size and line length: Physical reading conditions affect how easy text is to process. Optimal line length is 50–75 characters; font size for body text should be at least 16px for web.

Target Readability Scores by Content Type

Consumer websites and landing pages: Flesch 60–70, Grade 7–8
Blog posts and articles: Flesch 60–70, Grade 8–10 depending on topic
Patient health materials: Flesch 70–80, Grade 5–6 (most guidelines specify this)
Government public communications: Grade 8 (US Plain Language Guidelines standard)
Internal business reports: Grade 10–12 is acceptable; Grade 14+ signals over-complication
Academic papers: Grade 14–18 is typical and often appropriate
Legal contracts: Grade 16–20 is common; Grade 10–12 is achievable and increasingly targeted

Quick readability check in Microsoft Word: Go to Review → Check Accessibility → Reading Level. Word shows Flesch-Kincaid Grade Level and Flesch Reading Ease. Run this before any important document goes out. If the grade level is more than 2 above your target, identify the longest sentences and the most complex words first.

Using AI for Readability Improvements

AI rewriting tools handle the sentence-length and word-complexity patterns well. Effective prompts:

"Rewrite this to target a Grade 8 reading level. Shorten sentences over 20 words and replace multi-syllable words with shorter equivalents."
"Simplify this paragraph. No sentence should be longer than 18 words."
"Convert passive voice to active and shorten all sentences over 20 words."

After AI rewriting, run the output through a readability tool to verify the score improved. Then read it yourself to confirm no meaning was lost or accuracy compromised.

Frequently Asked Questions

What is a good readability score?

For Flesch Reading Ease (0–100): 60–70 is plain English for general audiences. For Flesch-Kincaid Grade Level: Grade 8 is the target for most general content. For Gunning Fog: below 12 for general audiences. The right score depends on your audience — healthcare materials target Grade 6; legal contracts may intentionally be Grade 16+.

How do I improve my Flesch Reading Ease score?

Flesch Reading Ease is based on average sentence length and average syllable count per word. To improve it: shorten sentences (split any sentence over 25 words), replace multi-syllable words with shorter synonyms where meaning isn't lost, and use active voice. Every sentence under 15 words with common vocabulary pushes the score up.

Does a better readability score mean better writing?

Not necessarily. Readability scores measure processing ease, not accuracy, depth, or appropriateness for the audience. A legal contract intentionally uses precise formal language that scores poorly. The goal is to score appropriately for your audience, not to maximize readability universally.

What tools measure readability?

Common tools: Microsoft Word (Review > Check Accessibility), Hemingway App (hemingwayapp.com), Readable.com, Grammarly (premium), and Yoast SEO plugin for WordPress. Most calculate multiple metrics simultaneously including Flesch Reading Ease, FKGL, and Gunning Fog.

Can AI improve readability scores automatically?

Yes — AI rewriting tools are effective at the patterns that drive readability scores: shortening sentences, replacing multi-syllable words with simpler alternatives, and converting passive to active voice. An AI rewrite targeting "simpler, shorter sentences" will reliably improve Flesch and FKGL scores. Always check for meaning retention after simplification.