How can i find Keyword density

[nomi147]

There is no single optimal or universal keyword density percentage. Each search query is unique & search engines compare (or normalize) documents against other top documents to determine some of their specific thresholds. Some keywords like "credit cards" naturally appear as a two word phrase, whereas other terms may be more spread out. Further, some highly trusted websites with great awareness, strong usage data & robust link profiles can likely get away with more repetition than smaller, less trusted sites can.
Lazy & uninformed cheap outsourced writing tends to be fairly repetitive - in part because people paid by the word to churn out cheap content have an incentive to bloat the word count, no incentive to trim the fat, and no incentive to do deep research. Google's leaked remote rater guidelines tells raters to rate low-information repetitive content poorly.