Your keyword density is also a factor that affects your search engine rankings. Search engines determine the relevance of your website to a particular subject by the use of keywords in your web page text. The higher the density of the keyword, the more relevant the web page for that keyword subject. However too high a keyword density, and the search engines will consider you trying to spam the search engines and will penalize your website for keyword stuffing, or keyword spamming. Content with a conversational tone or a natural editorial flavour can produce a premium keyword density and leave you with good quality content. The old rule of thumb is that your keyword should never appear in more than half of the sentences on the page. A better approach is to have your keyword not appear in more than 1/3 of the sentences, yet use synonyms and other related keywords on the page as well to add relevance. In total, you don’t want your keyword density to be above 3%. Tools like keyworddensity.com can give you a quick reference to web page keyword density.