The PageRank Equation

OK, I know you’ve waiting for it, so here is the official PageRank equation. Although impressive looking, it’s not really that complicated:

PR(your page) = 0.15 + 0.85 [(PR(page A) / total links (page A) ) + (PR(page B) / total links (page B) ) + «]

There are a couple of observations to note about the PR equation:
PR values for based on individual web pages.


The PR value of each page that links to your site in turn is dependent on the

PR of the pages that link to it, and so on backwards.


A link’s value (amount of PageRank or “voting power” forwarded to the linked- to page) is only 85% of the linking page’s PageRank value, and this value is diluted (decreased) by the number of other links on that page.


PR has nothing to do with keywords - it is purely dependent on link quantity and link strength, as discussed previously.

After playing around with the equation, some may incorrectly conclude that a link from a page with a PR=4 with only a few outgoing links is worth a more than a link from a page with a PR=7 with 100 outgoing links because for the latter, the “voting power” or value is divided up among 99 other links.

However, you must remember the logarithmic nature of the true PageRank. This means that a link from a PR=7 page that has lots of outbound links may be worth more than a link from a PR=4 page that has only a few outbound links. Whether this is true is dependent on the log base used for the PR equation, which is a secret.


Do not get caught up in the minutiae of determining whether a site is worth exchanging links with. Barring link farms, Free-For-All (FFA) sites, sites with a PR of 0 (which either aren’t indexed or have been “blacklisted” by Google), and sites that have nothing to do with your theme, you should strive to get more links that point to your site - period.

Note: Google performs from 20 - 40 iterations of the PageRank equation for each page in it’s entire index to determine the new PageRank value each month. This process takes up to a week to accomplish and is the primary cause of the “Google Dance” each month. For more information, see Deep Crawl and the Google Dance.

In most cases, when you want a link to your site placed on another site, the other site owner will want to have a link to their site put on your site as well. This is called "reciprocal linking". It is for this reason that you should create and maintain a "Related Links" page on your site.

In addition, you should also create a “Link to Us” page where other site owners can simply copy your HTML link code to their Links page. In this way, you control the use of keywords in the text of such links that point to your site.


Note: If you won’t be using different graphic banner ads, you can combine these two pages into one. In this case, simply list your “link to us” code at the top of your Related Links page.