The Google Toolbar's PageRank feature displays a visited page's PageRank as a whole number between 0 and 10. The most popular websites have a PageRank of maximum 10 (e.g www.wikipedia.com). The least is 0. Google has not disclosed the precise method for calculating the Toolbar PageRank value.
The Google Toolbar is updated approximately 5 times a year, so often shows out of date values. It was last updated on 13/14 February 2010.
