Keyword density is the proportion of words or phrases repeated in a text; it is a descriptive count, not a target for search rankings.
Decision rule and boundaries
Keyword density is the proportion of words or phrases repeated in a text; it is a descriptive count, not a target for search rankings. Density is a descriptive ratio, not a target. Repetition becomes a quality issue when it makes prose less precise, interrupts the answer, or is added solely to influence search systems rather than help a reader.
How to inspect it
Read the title, headings, opening answer, and a full paragraph aloud. Check whether repeated phrases name a necessary concept, distinguish variants, or merely restate the same wording while crowding out definitions and evidence.
Practical workflow
Keep the vocabulary required to explain the subject, then replace forced repetitions with the accurate terms a knowledgeable reader would expect. Preserve disambiguating wording even if a raw count rises or falls.
Common mistakes and measurement limits
There is no safe universal percentage. Removing every repeat can make an explanation vague; adding repeats to reach a formula can make it less helpful and may conflict with spam guidance. The common failure mode is chasing a percentage or inserting phrases where they do not help the reader.