Well we have various criteria for PR but backlink is given more weitage as far as deciding PR of a website do u know how much back link equals to 1 PR or it is 100 link or more plz share ur experiences..........
Check this website to undersdand how calculate the Page Rank => www(.)smartpagerank.com/pagerank-calculation-chart.php
very thanks of you but do u have any other chart as it is little difficult to understand the table start range and end range
This picture is more simply to understand : http://www.flickr.com/photos/alifrich/4011887562/ For example if you want a PR4. you need 101 backlinks from PR3. But be careful, if there are so many backlinks on a page then you need more backlinks... These calculs are make with approximatively 40 baclinks per pages
Not only the number of links is important but also the PR of the site that the link comes from. A thousand PR 0 links is not as good as one PR 5 link. I personally only exchange links with sites that are one PR below the level of my site.
Not the PR of the site but the PR of the page You can build a backlink from page PR 0 on website PR 8 . And you can buil a backlink from page PR4 on website PR5. (that is so better )