PageRank offers you a free tool to check Google ™ page ranking of any web site pages easily. This site is not affiliated in any way with Google.

How is pagerank calculated?
The way in which Google calculates the page rank is based upon links between pages. Each link from one page to another represents a vote to the page the link points to. Basicaly, the more links page receives, the higher its importance becomes. Google updates the pagerank visible in the Google toolbar from time to time. The PR displayed is not the current page rank of the URL, but the one from the last toolbar pagerank export. These exports take place about 3 or 4 times per year.

Refferences
• Google Technology
• Pagerank Wiki

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