PageRank (PR) is a link analysis algorithm. Anything over 300+ algorithm page rank is one of the most popular signals to boost Google SERP. PR ranges from 0 to 10, and of course the higher the rank, the better.
PR calculation from the year 2007 is not very accurate, but it gives us a raw idea of how it is calculated.
Through the chart below, we can conclude that getting a few backlinks from authoritative sites is much more effective than getting hundreds of backlinks from low quality sites. A website that barely qualifies for PR 5 may only have 5,033 votes, while a very strong PR 5 website might have 27,213 votes.
Page Rank Calculation |
|
Start |
End |
Median |
Median |
Links |
Links |
Links |
Links |
PR |
Range |
Range |
Value |
PR Passed |
for PR5 |
for PR6 |
for PR7 |
for PR8 |
|
1 |
6 |
30 |
15 |
0.37 |
13,442 |
73,931 |
406,621 |
2,236,418 |
2 |
30 |
164 |
82 |
2.06 |
2,444 |
13,442 |
73,931 |
406,621 |
3 |
166 |
900 |
453 |
11.33 |
444 |
2,444 |
13,442 |
73,931 |
4 |
915 |
4,948 |
2,492 |
62.29 |
81 |
444 |
2,444 |
13,442 |
5 |
5,033 |
27,213 |
13,704 |
342.61 |
15 |
81 |
444 |
2,444 |
6 |
27,681 |
149,670 |
75,374 |
1,884.35 |
2.6709 |
14.690 |
80.794 |
444.365 |
7 |
152,244 |
823,186 |
414,557 |
10,363.94 |
0.4856 |
2.671 |
14.690 |
80.794 |
8 |
837,339 |
4,527,522 |
2,280,066 |
57,001.65 |
0.0883 |
0.486 |
2.671 |
14.690 |
9 |
4,605,367 |
24,901,372 |
12,540,364 |
313,509.09 |
0.0161 |
0.088 |
0.486 |
2.671 |
10 |
25,329,516 |
136,957,543 |
68,972,000 |
1,724,300.01 |
0.0029 |
0.016 |
0.088 |
0.486 |
|
|
Assumption: |
85% |
of_median_value_passed | | | | |
|
Assumption: |
40 |
links_per_page_average | | | | |
PR is basically a popularity contest, each site linked to yours counts as a vote. If the votes come from low PR sites, you won't win the crown.
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Note: only do follow link pass the PR juice, so no follow link do not help to increase PR. No Follow Link Attribute: <a href="http://www.example.com/" rel="nofollow">Example</a>
Still not enough? Read articles collected by
sitepoint to know more about the backend workings of PR.
Stanford University: Thesis of Google's creators
http://www-db.stanford.edu/~backrub/google.html
PR and Link Structure
http://www.sirgroane.net/google-page-rank/
PR Concept
http://pr.efactory.de/e-pagerank-algorithm.shtml
Link Types and PR calculator
http://www.webworkshop.net/pagerank_calculator.php3