Value of the key??? Do you mean keyword analysis? imean searches and competition for a particular keyword?
specify what you mean by value of a keyword? if you want to know the CPC of a keyword, log into your adwords account and search it in the google keyword tool
If you want to see if the keywords have value, just put it into the search engine box and see the ads there, if there are eight advertisement teher, it says that your keywords have great value and have got really big competition
If you want to see keywords value then you need to do analysis...there are lots of good tools out there i would recommend Google Adwords tool
Look at the value of the keywords from a product perspective also, like amazon for example. The keyword may also be valuable because of a clickbank product, affiliate program, or simply just adsense.
You can use the Keyword Ranking report in Search Engine Visibility to see where your site ranks on search engines for specific keyword searches. Search Engine Visibility shows you the ranking information for saved keywords on your home page keywords, as well as keywords shared throughout the site.
You can see the value of your keywords from google adwords. If your keyword has less visitor and low competition then that keyword will be valuable to you.
keyword is one of the important part of any website promotion. keyword is address of your webpages so try to select niche related keyword to promote your website. visitor find your website through your keywords.
I valued them using 2 factors. Look in the screenshot below. One is the Adwords Competition, and the other is the Profit Potential, which is the relation between CPC and the amount of searches. Those 2 factors help me find highly profitable keywords that I can use on my sites.
Value in terms of what? Demand, Supply or Competition? Anyways the best way to research all of these is using Google Adwords Keyword Tool. This tool is completely free.
If you means the keyword ranking in SERP its very simple. go to your respective search engine whether its Google or bing or yahoo. Then Choose global search URL. If you need to find region wise its also possible. Eg if you need to find the ranking for australian region it is also possible.