What is Page Rank?

PageRank is one of more than 100 factors Google uses in the ranking of your website and your resulting position on their search engine. You get PageRank (PR) by having backward links from other website pages that have a higher PR than your site. The PR of your site is updated about once of month when Google updates their database of web pages.

In your pursuit for a high PR, keep in mind that numerous relevant keyword anchor texted backlinks will get you a higher SERP than just raw high PR. As relevant keyword anchor texted backlinks increase, so will PR.

Your aim shouldn’t be just for high PR, but for proper backlinks that will bring with them a higher PR.

How is Page Rank Calculated?
The following will give you an idea of how many inbound links and what PR those inbound links need to be, for you to obtain the desired PageRank for your pages. The following pagerank algorithm equation is the relationship between two pages A and B, with the below example page A receiving an inbound link from page B.
PR-A = (0.15) + (0.85 x PR-B / TOL-B)

PR-A is the PageRank of Page A, PR-B is the PageRank of Page B, and TOL-B is the Total Outbound Links of Page B.

For example, if you get a inbound link from a page that has a PR of 6 and on that page there is a total of 6 outbound links (counting the one to your page), a PR of 1 will be added to your page: 0.15 + (0.85 x 6/6) = 1. If that one inbound link adds a PR of 1 to your page, and you wanted a PR of 5 it would take 5 similar inbound links.

When you are looking for inbound links, just divide the PR of the page by its outbound links and this will give you a general idea of the PR a inbound link from that page would give you.