What is keyword density?

Keyword density refers to the percentage of times a specific keyword or phrase appears on a webpage relative to the total number of words on that page, and it was historically used as a metric to gauge how relevant a page was to a particular search term. It's calculated by dividing the number of times a keyword appears by the total word count of the page, then multiplying by 100 to get a percentage, so if a 500-word article mentions a keyword 10 times, that would represent a 2% keyword density. In the early days of SEO, many website owners believed there was an ideal keyword density percentage, often cited as somewhere between 1% and 3%, that would help pages rank better, leading to widespread keyword stuffing where content was written unnaturally just to hit a target density number. However, modern search engines like Google have moved far beyond simple keyword counting, now using sophisticated natural language processing and semantic understanding to evaluate content relevance and quality holistically rather than relying on rigid keyword ratios. While keyword density itself is largely outdated as a strict metric to optimize for, naturally incorporating relevant keywords and related terms throughout well-written, genuinely helpful content remains important for both search engines and readers.