Keyword density is a metric that determines the percentage of keywords in relation to the total number of words in a text. To calculate the density, divide the number of keywords by the total volume of the text and multiply the result by 100%. For example, if there are 20 keywords among 1000 words, the density will be 2%. Keyword density is directly related to the term «text nausea», which determines the amount of all repetitions in the text. Readability depends on these metrics, and the task of a copywriter is to provide word variety.
The density metric affects the perception of the text and can have both negative and positive effects. Properly distributed keywords make the text informative and help search engines understand its content. If the keyword density is too high, it will lead to text spamming. Readers who see such text will perceive it as low-quality and obviously SEO-driven. Each copywriter and SEO specialist has their own understanding of what density can be considered normal. But most believe that the metric should not exceed 5-7%. If the percentage is higher, it is better to revise the text and make it more diverse.