You can yoast USE seo tool . Its the best for seo optimization

Ranks NL Page Analyzer shows keyword density and placement of web pages. Among other things the tool features options to show the page’s headers, page elements, outgoing links, Google PageRank, the guessed language, location of the server and more! I recommend using this tool to check the density of keywords and other stats of your webpage.

Keyword density is the percentage of times a keyword appears in your content compared to the total number of words on the page. Keyword Density is an important aspect of the Search engine optimization (SEO) process. Once you have gone thorough keyword research and have collected a list of keywords, you must consider how will you use your keywords terms.

There are many tools to check keyword density. You can use Alexa also for this.

You should use the keywords density tool

Keyword density is the percentage of times a keyword or phrase appears on a webpage compared to the total number of words on the page.
One more way to find the keyword density is by KEYWORD DENSITY ANALYZER tool.

You can try longtailpro or semrush or sites like kwfinder

SEO Quake is a tool for analysing page content from an SEO point of view. It is a Firefox browser addon. It also gives keyword density for individual words and 2 and 3 word phrases

Keyword density is the percentage of times a keyword or phrase appears on a web page compared to the total number of words on the page. In the context of search engine optimization keyword density can be used as a factor in determining whether a web page is relevant to a specified keyword or keyword phrase.

There is no single ideal or all inclusive catchphrase thickness rate. Every inquiry question is one of a kind and internet searchers look at (or standardize) archives against other top reports to decide some of their particular limits. Some catchphrases like "charge cards" normally show up as a two word phrase, while different terms might be more spread out. Further, some exceedingly trusted sites with incredible mindfulness, solid use information and powerful connection profiles can likely escape with more redundancy than littler, less trusted locales can.

Languid and clueless modest outsourced composing has a tendency to be genuinely dreary - to some extent since individuals paid by the word to produce modest substance have an impetus to bloat the word number, no motivation to trim the fat, and no motivator to do profound examination. Google's released remote rater rules advises raters to rate low-data redundant substance ineffectively.

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