What Is Keyword Density, and Does It Still Matter?
Keyword density is the percentage of words on a page that are a given term. The Keyword Density Checker measures it, and the honest headline is that there is no target figure and Google has never published one.
Where the idea came from
Early search engines really did count. If a page said "cheap flights" more often than its competitors, it ranked higher, and the whole technique of keyword stuffing follows from that - invisible text, repeated phrases, footers full of city names.
Search engines got better at this faster than the industry stopped doing it. Modern ranking uses the meaning of a page, the words around the term, what other pages link to it and what searchers do after clicking. A raw count of one phrase is a weak and trivially gamed signal, and the "two to three per cent" figure that circulates has no official source behind it.
Stuffing is now actively penalised rather than merely ignored, which makes chasing a density target not just pointless but risky.
What the measurement is still good for
Three genuine uses survive.
Finding accidental repetition. Writing about one subject at length produces more repetition than you notice, and a density check surfaces the phrase you have used nineteen times. That is an editing signal, not a ranking one - the fix improves the writing.
Checking you mentioned the subject at all. The opposite failure is real: a page about tax returns that never uses the phrase, because the author wrote around it. If your main term appears once in 1,500 words, a reader skimming cannot tell what the page is about either.
Seeing what a page is actually about. Run the checker on a page and the top terms should describe its subject. If they are mostly navigation words and filler, the content is thinner than it looks.
What replaced it
Covering the subject properly. A page that genuinely answers a question uses the related vocabulary naturally - a good article about mortgages mentions interest, term, deposit and repayment without anyone planning it.
That is what search engines look for now: whether the page reads like something written by someone who knows the subject. The practical test is better than any metric - read it aloud. If a phrase appears so often that it sounds odd spoken, it is too often, whatever the percentage says. The Readability Score Checker is a more useful instrument than density for most pages.
Common questions
Is there an ideal density?
No. Anyone quoting a figure is quoting folklore.
Where should my main term appear?
The title, the first paragraph, and one or two headings, because those are where a reader looks. Then wherever it falls naturally.
What about related terms?
More useful than repeating the main one. They signal that the subject is covered rather than mentioned.
Can I be penalised for too much?
Keyword stuffing is an explicit violation of Google's spam policies, so yes.
Want to see what a page is actually weighted toward?