Readability checker
Flesch Reading Ease, Flesch–Kincaid grade, Gunning Fog, sentence length and reading time — measured on whatever you paste. No account, no upload.
Our team reviewed two hundred UK small business homepages last quarter. Most of them were written for the business owner rather than the customer, and the sentences carried too much detail. We rewrote the first paragraph of each page so that a reader understands the offer before the second sentence. Nothing else changed.
Paste at least a sentence to see the scores.
- Flesch Reading Ease
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- Flesch–Kincaid grade
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- Avg sentence
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- Long words
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Paste at least a sentence to see the scores.
Longest sentences
Most frequent long words
none
How the score is calculated
Flesch Reading Ease uses average sentence length and average syllables per word:
206.835 − (1.015 × words ÷ sentences) − (84.6 × syllables ÷ words)
Higher is easier. The Flesch–Kincaid grade estimates the US school year needed to read the text, and Gunning Fog weights the share of words with three or more syllables. Syllables are counted with a rule-based estimate, not a dictionary, so unusual words can be off by one — the effect on a 300-word page is negligible.
What to aim for
- 60–70 — plain English. The band UK public-sector guidance asks for, and a realistic target for B2B pages.
- 70+ — comfortable for consumer pages, newsletters and support content.
- Below 50 — fine for a specialist reference page, expensive for a landing page.
Treat the number as a diagnostic, not a target to game. Splitting one 40-word sentence into three shorter ones usually lifts the score and genuinely helps the reader; deleting every technical word to raise it does not.
Fix in this order
- Cut the longest sentences first — the list above shows them.
- Replace nominalisations: utilisation → use, authorisation → approval.
- Move the offer into the first sentence, before any context.
- Then run the editing checklist for the things a score cannot see.
Related: plain English writing, readability for SEO, and the spelling converter if the text is heading for a UK or US audience.
We edit to a measured standard.
Send a page and we will return a readability and clarity pass with a marked-up version you can publish.