What Is a Readability Score Good For — And When Should You Ignore It?

Quick scan

You wrote a draft and it scored a 45 on the Flesch scale. Is it bad? Not necessarily. Readability formulas measure the ratio of words to sentences and syllables to words. They do not understand the meaning of your text. This guide shows you when a low score is a useful warning, and when a high score is a dangerous illusion.

The illusion of clarity

A high readability score (like 80+) means the sentences are short and the words are simple. It does not mean the text is true, helpful, or logically sound.

Example 1: Clear but useless

"The moon is made of green cheese and you can fly there on a bicycle."

This sentence is short, uses basic words, and gets a fantastic readability score. It is also complete nonsense.

Example 2: Dense but necessary

"In asynchronous JavaScript, a Promise represents the eventual completion (or failure) of an operation and its resulting value."

This sentence gets a much lower score because words like "asynchronous" and "operation" have multiple syllables. But if you are writing a developer guide, removing those words to improve the score will destroy the accuracy of the text.

When to use the Readability Checker

The Readability Checker is useful as an early warning system for friction.

Use it when:

1. You are writing for a broad audience: If your privacy policy scores a 30 (very difficult), you are probably using too much legal jargon.
2. You are editing your own work: When you are too close to the text, a low score can break the spell and show you that your sentences have become unmanageably long.
3. You are reviewing a dense draft: If a paragraph has 5 sentences and 150 words, the Flesch score will plummet, telling you to break it up.

What the score cannot do (The limitations)

A readability score is a mechanical calculation. It cannot:

• Measure nuance: It treats all long words as "hard", even if they are standard terms in your industry.
• Judge tone: It cannot tell if you are being helpful, condescending, or confusing.
• Verify facts: As shown in the moon example, it cannot tell if your text is actually true.

The recommended workflow

Do not optimize for a perfect score. Optimize for the reader.

1. Clean your draft using the Text Workbench.
2. Run it through the Readability Checker.
3. If the score is unusually low for your intended audience, look for the longest sentences and break them in half.
4. Stop when the text feels right to a human, even if the score isn't perfect.

FAQ

Is a Flesch score of 45 good or bad?

It depends on your audience. A score of 45 (Standard difficulty) is appropriate for a professional article. A privacy policy aimed at general consumers should aim for 60 or higher. A developer API reference can score 30 or lower without being a problem. Use the score relative to your reader, not as an absolute grade.

Should I always try to improve my readability score?

No. Optimizing for a high score can make technical content less precise. The score is a friction signal — act on it when the text is harder to read than it needs to be for your audience, not to reach a specific number.

Does the Readability Checker save or send my text?

No. The Readability Checker runs entirely in your browser. Pasted text is never sent to a server.

Next steps

• Test a draft in the Readability Checker.
• Read Write once, tune twice for a complete editing workflow.