In a simple word, keyword density mean how many time the keyword will appear in your content/article. For example, if I have a 500 words articles on "dog training" and the word "dog training appear 15 times in that articles, that mean keyword density for the articles is 3% (15 divide by 500). But don't use many same keyword in your content otherwise you will be penalized by search engine because of keyword stuffing/keyword spamming. Hope that helps.
Here is my rules: For one word keyword, I use 4% to 7% But for multiple keyword phrases, I'll go lower. For a four word phrase I may only go 2% or less. It just isn't natural to have long phrases repeated many times. It is always better to be too low than too high. Keep it as natural as possible. Hope this helps...
calculated by dividing the number of the times a keyword is mentioned in a page and dividing it by the total number of words in the page *100 You can try this: http://www.seochat.com/seo-tools/keyword-density/
I use between 6-10% for each keyword on a page but they key is to keep it natural. Stuffing a page with keys words will get you penalised, Dave
the keyword density importance will soon decrease. google is becoming smart enough to figure it out. don waste too much time on this.
desity means howmany times your keyword comes compared to your total content..I would suggest repeat keyword 6,7 times a page..dont exceeed ..else google wont like it.
Somewhere around the ~5% mark has been proven to work for many. If you're going over 10%, it's starting to look unnatural and @ ~2%, you're just not keeping your sites optimized for those keywords.