Readability Guide: Make Your Writing Clearer
A practical, in-depth guide to readability scores, how they work, and how to use them to write content that more people can understand.
What is readability?
Readability measures how easy it is for a reader to understand a piece of text. It is not about how “good” or “bad” your writing is — it is about how much effort a typical reader needs to make sense of it. Readability is influenced by sentence length, word length, syllable density, vocabulary complexity, and the structure of your paragraphs. When you write for a broad audience, keeping readability high means more people can follow your ideas without re-reading sentences or reaching for a dictionary. You can check your readability score live using the word counter on the homepage.
The Flesch Reading Ease formula
The Flesch Reading Ease score, developed by readability researcher Rudolf Flesch in 1948, is one of the most widely used readability metrics. It produces a score between 0 and 100, where a higher score means the text is easier to read. The formula combines two factors: average sentence length (in words) and average syllables per word. Shorter sentences and shorter words produce a higher, more readable score.
The formula itself is: 206.835 − (1.015 × ASL) − (84.6 × ASW), where ASL is the average sentence length and ASW is the average number of syllables per word. You do not need to calculate this by hand — QuickWord Counter computes it automatically as you type and shows your live score.
| Score | Reading level | Description |
|---|---|---|
| 90–100 | 5th grade | Very easy to read. Easily understood by an 11-year-old. |
| 60–70 | 8th–9th grade | Plain English. Readable by most adults. |
| 30–50 | College level | Fairly difficult to read. |
| 0–30 | Graduate level | Very difficult. Best for academic or specialist readers. |
The Flesch–Kincaid Grade Level
A companion metric, the Flesch–Kincaid Grade Level, translates the same data into a U.S. school grade. A score of 8.0 means a typical eighth-grader could understand the text. This is especially useful in education, government, and healthcare, where materials are often required to meet a specific grade-level target. The U.S. government recommends that public-facing documents be written at roughly a 7th to 8th grade level so that the widest possible audience can understand them.
Why readability matters for the web
Online, people skim. Research from the Nielsen Norman Group consistently shows that users read only about 20% of the words on a typical web page. When your sentences are long and dense, skimming becomes harder and readers leave. Clear, readable writing keeps visitors on the page longer, reduces bounce rates, and increases the chance they take the action you want them to take. For SEO, readability is an indirect ranking factor — Google rewards pages that keep visitors engaged, and readable content does exactly that. To check whether your keywords are over-optimized (which can hurt readability), use the keyword density checker, and for the relationship between content length and rankings, see our guide to blog post length for SEO.
Practical tips to improve your readability score
- Shorten your sentences. Aim for an average of 15–20 words. Break long sentences into two wherever a natural pause exists.
- Use shorter words. “Use” instead of “utilize,” “help” instead of “facilitate.” Fewer syllables raise your score.
- Prefer the active voice. Passive constructions add words and obscure who is doing what. “The team launched the product” beats “The product was launched by the team.”
- Cut filler words. Words like “very,” “really,” “just,” and “that” often add length without meaning. Removing them tightens your prose.
- Write shorter paragraphs. Two to four sentences per paragraph is ideal for screen reading. Short paragraphs create visual breathing room.
- Define jargon. If a technical term is unavoidable, define it on first use or link to a glossary.
When a lower readability score is fine
Not every piece of writing should aim for a 70+ Flesch score. Academic papers, legal briefs, medical documentation, and specialist technical content often need precise terminology that naturally lowers readability. The goal is not to dumb down your writing, but to match your readability to your audience. A peer-reviewed neuroscience paper read by PhDs can sit at a grade-14 level; a customer support article should sit at grade 8 or below. Use the readability score in QuickWord Counter as a calibration tool: know your audience, then aim for the range that serves them.
How to use QuickWord Counter for readability
Paste your text into the editor on the homepage and scroll to the Readability panel. You will see your live Flesch Reading Ease score, the Flesch–Kincaid grade level, and a plain-English label describing what the score means. As you edit — splitting sentences, swapping in shorter words, trimming filler — the score updates in real time. This immediate feedback loop is the fastest way to internalize what clear writing feels like. For word count benchmarks by document type, see our word count guide.