Flesch Reading Ease Score Explained

The Flesch Reading Ease score is one of the most widely used readability tests in the world. It rates how easy a piece of text is to understand on a scale from 0 to 100 — the higher the score, the easier the read. Developed by author Rudolf Flesch in 1948, it’s built into word processors, content tools, and writing apps everywhere. Here’s how it works and how to use it.

What the scores mean

A higher score means your writing is more accessible. Here’s the standard interpretation:

Score	Reading level	Description
90–100	5th grade	Very easy to read
80–90	6th grade	Easy to read
70–80	7th grade	Fairly easy
60–70	8th–9th grade	Standard / plain English
50–60	10th–12th grade	Fairly difficult
30–50	College	Difficult
0–30	College graduate	Very confusing

For most general audiences — blog posts, marketing, web content — aim for 60 or above. That’s the “plain English” zone that the widest range of readers can follow comfortably.

How it’s calculated

The Flesch Reading Ease formula uses two things: how long your sentences are and how long your words are (measured in syllables).

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

In plain terms:

• Longer sentences (more words per sentence) lower the score.
• Longer words (more syllables per word) lower the score.

So short sentences made of short words score high (easy), while long sentences full of multi-syllable words score low (hard). You don’t need to do this math by hand — readability tools calculate it instantly.

Why readability matters

Easy-to-read writing isn’t “dumbed down” — it’s respectful of the reader’s time and attention. Clear content:

• Keeps readers on the page longer, which helps SEO. (It pairs well with getting your blog post length right.)
• Reaches a wider audience, including non-native speakers and people skimming on phones.
• Communicates more effectively, because the reader spends energy on your ideas, not on decoding your sentences.

Even expert audiences prefer clear writing. Studies repeatedly show that readers rate simpler writing as more intelligent, not less.

How to improve your score

1. Shorten your sentences. If a sentence runs past 20–25 words, split it. This is the single biggest lever.
2. Choose shorter words. “Use” instead of “utilize,” “help” instead of “facilitate,” “about” instead of “approximately.”
3. Cut filler. Phrases like “in order to,” “due to the fact that,” and “at this point in time” add syllables without meaning.
4. Break up dense paragraphs. Whitespace doesn’t change the math, but it makes the page feel readable and encourages tighter writing.
5. Read it aloud. If you run out of breath before the end of a sentence, it’s too long.

A simple habit

Check the Flesch Reading Ease score of anything important before you publish. Paste your draft into a readability checker, see where you land, and if you’re below 60, look for the longest sentences and biggest words to trim. A minute of editing can move your content from “difficult” to “plain English” — and reach a lot more readers.