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Google Pagerank (PR) - is an index of value of web page used by google search engine. Please note that PR goes to each individual page of web site, but not to the whole website. Every site has pages with different PR values.

PR value is usually treated as site rank, which is not correct - that’s website front page rank. Web page PR value is calculated out of number and rank of linking pages.

To get PR2 your site needs to have :

• 101 linking pages with PR1
• or 18 linking pages with PR2
• or 3 linking pages with PR3
• or 1 linking page with PR4 and up

This is true only in that perfect case if that linking page has only one link going to your site. In real world number of pages has to be higher.

Also you have to count that google may not consider links from pages involved in persistent link exchanges, forums etc. Also links with rel=”nofollow” attribute are not counted. The graph of PR is going from 1 to 10 and has logarithmic progression and not lineal. So you can’t say that website with PR2 is twice more valuable than PR1 website.

Here some useful links:

Google Webmaster Guidelines (official)