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What This Calculator Shows

This calculator gives you the estimated value of PageRank that should be passed on from a web page to each "do follow" link. This is value is calculated using the PageRank formula originally written by Google.

Determining the actual value of a link is important to know because a high PR web page does not mean that it's the best page to get a link from. Remember all PageRank is shared equally among all links on that page, therefore a web page with a high PR and many links could potentially pass only a small amount of PR in comparison to a lower PR page with little or almost no links on it.

How It Works

General Overview
The calculator retrieves the PageRank of the web page in question and counts out the number of links on that page, then takes the PageRank Formula and runs a small calculation to produce an estimated amount of PR that would get passed on to each link on a page based on the input you provide.

Details
The calculator works based off the Google PageRank formula from the original paper on PageRank by Google founders Sergey Brin and Lawrence Page. That formula can be expresed by the following equation 1.

PR(A) = (1-d) + d (PR(T1)/C(T1) + PR(Tn)/C(Tn) + ...)
Using that formula and some algebra the formula was setup so that the it could be solved for the amount of PR passed on to links on that page. Basically it calculates how much PR or "link juice" is spilled over from that web page out to each link on the page. Only links that are "do follow" are counted as links that will take a piece of the PageRank

With the calculated link value you can really see how valuable a link from a specific web page is. A high PR page with many links might not be as valuable as a page with less links and a little lower PR because it all depends on the amount of link juice that gets passed on.

Damping Factor
The damping factor is a number representing the probability that a Internet surfer randomly clicking on links will eventually stop clicking. And according to the original paper on PageRank by Google founders it's usually set to 0.85 1. We've left this as something you can change and fill in as the number might have changed since the original formulation of the PageRank formula. Changing that number can create radically different results and since we don't know exactly what it is we've left it open for experimentation.

This is value in terms of amount of PR that will be passed on to your each web page linked to from the web page your checking.

References
1 Sergey Brin and Lawrence Page (1998). "The anatomy of a large-scale hypertextual Web search engine". Proceedings of the seventh international conference on World Wide Web 7: 107-117 (Section 2.1.1 Description of PageRank Calculation).