Keyword density is a 2005 metric
There is no density target. Google has said, more than once and unambiguously, that there is no ideal keyword density and no ratio that triggers a penalty. Every "aim for 1 to 2%" article is repeating advice that stopped being true before most of the people quoting it started working in search.
So why measure it at all? Because the number is still diagnostic, just not in the way the old advice claimed. Density does not tell you whether Google will rank the page. It tells you what you actually wrote about, which is often not what you meant to write about.
What to look for
- A term you did not intend at the top. If your page about content audits is topped by "team", the emphasis drifted.
- Your actual topic missing from the top ten. The clearest sign a page is about something adjacent to its title.
- The same phrase twelve times. Almost always accidental, and almost always makes at least three sentences clumsy.
The better question
Not "how often does this phrase appear" but "does this page answer the question". That is what an answer engine evaluates, and it is what the readability checker gets closer to by looking at structure rather than frequency.