Google PageRank: Frequently Asked Questions - How does my PageRank increase?
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PageRank increases in a geometric manner similar to the earthquake Richter Scale. For example, it is harder to go from a PR4 to a PR5, than it was to reach the PR4 from a PR3. In a similar fashion, it's even harder to get to a PR 6, than it was to get to PR5 from PR4, and so on up. Each level requires increasingly more high value incoming links than did the previous level.
How can I find out my Google PageRank?
PageRank is displayed in increasing amounts of green on a gauge on the Google Toolbar. The Google toolbar can be downloaded for a PC at http://toolbar.google.com. The toolbar also displays a sampling of the page’s inbound links, but is not considered a reliable indicator of current PageRank. There is no Google Toolbar currently available for a Mac. Google maintains the true PageRank internally, and the toolbar display is generally agreed to be very inaccurate.
How soon do the backlinks and PageRank show up on my Google Toolbar?
It often takes two full monthly updates for all of your incoming links to be discovered, counted, calculated and displayed as backlinks. Even then the PageRank displayed on the Google toolbar is outdated. Google maintains the correct PageRank internally at their own computers. The green line shown on the toolbar is often very outdated, and very possibly entirely incorrect.
Do all of my backlinks get displayed along with the PageRank?
Google only shows the backlinks it has found and calculated for your pages that have a PR4 or higher. All links are included in the tabulation, however. Like the PageRank display, the backlink display on the toolbar is very misleading, and under-represents the total number of inbound links, making do it yourself PageRank calculations more difficult.
Google Optimization 
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