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Notes on how UK brands write and present themselves, from the Brands over time research.
Flesch-Kincaid readability score: what it measures, and what sentence length contributes
13 October 2026
The Flesch-Kincaid grade level is 0.39 × words per sentence + 11.8 × syllables per word - 15.59, so it only sees sentence length and word length. A grade of around 8 is a common target for general readers, and no score can tell you whether a page is clear or accurate, or who wrote it.