You can write something technically correct and still lose your reader by the second paragraph. The problem usually isn't what you're saying — it's how easy it is to process.
Readability is a measure of how effortlessly a reader can understand your writing. It accounts for sentence length, word complexity, and the overall cognitive load your text puts on the person reading it. High readability means readers stay. Low readability means they leave.
This matters whether you're writing a blog post, a LinkedIn update, a product description, or an email to a client.
The most widely used measurement is the Flesch Reading Ease score, developed by Rudolf Flesch in 1948. It calculates a score between 0 and 100 based on two factors — average sentence length and average number of syllables per word.
Shorter sentences and simpler words produce a higher score. Longer sentences and complex vocabulary produce a lower one.
| Score | Level | Suitable For |
|---|---|---|
| 90–100 | Very Easy | 5th grade, general public |
| 70–90 | Easy | 6th grade, conversational |
| 60–70 | Standard | 7th–8th grade, most articles |
| 50–60 | Fairly Difficult | High school level |
| 30–50 | Difficult | College level |
| 0–30 | Very Difficult | Academic, professional |
Most successful blog posts and online articles score between 60 and 70. That's not dumbing down — that's respecting your reader's time and attention.
Online readers scan before they commit. Research consistently shows that most people read less than 30% of a web page before deciding whether to continue. Dense paragraphs, long sentences, and uncommon words all increase the chance they leave before reaching your point.
For business writing the stakes are higher. A proposal that's hard to read signals poor communication skills regardless of the quality of the idea inside it. A product description that requires effort to parse loses sales to a simpler competitor.
Most readability problems come from the same habits. Sentences that run longer than 20 words lose readers in the middle. Paragraphs that stack more than three or four sentences become visually dense and feel like work. Passive voice adds syllables and distance — "the invoice was sent by the team" takes longer to process than "the team sent the invoice."
Different platforms have different expectations. Twitter and WhatsApp reward extremely short, punchy sentences — often fragments are fine. LinkedIn sits in the middle, favouring clear professional language without academic density. Long-form blog content has the most flexibility but still benefits from shorter paragraphs and section headers that let readers navigate.
Academic writing intentionally scores low on readability — precision and specificity require complex language. But unless you're writing for a peer-reviewed journal, optimising for clarity is almost always the right move.
Start by measuring where you are. Paste your text into a readability scorer and note your Flesch score and average sentence length. Then edit with one goal — break your longest sentences in half. Read the result out loud. If you run out of breath before reaching a full stop, the sentence is too long.
Replace complex words with simpler ones where meaning is preserved. "Utilise" means the same as "use." "Commence" means the same as "start." The simpler word is always better unless precision requires the complex one.
Check the readability of your own writing instantly.
Try the Readability Scorer →