Google Page Rank Tool Firefox, What is Page rank and formula for page rank calculation.

Google toolbar is integrated with page rank checker tool. Lots of page rank checker tool bar available for Firefox, Mozilla, Chrome and internet explorer ie. Best is google toolbar with page rank checker which is available for fire fox, internet explorer and avast browser also available for Microsoft windows vista, windows xp.

What is page rank.

Page rank is a value assigned to the web site according to the google. Page rank or PR is a number from 0 to 10 which is assigned by google. Page rank is trade mark by google and which is developed by founder Larry Page and Sergey brin. This will give value to each web site according to the link analysis(in bound and outbound link) algorithm.
In simple word more the page rank that means web site is having more trust.

Simple formula for page rank checking.

 is
PR(A) = (1-d) + d(PR(t1)/C(t1) + ... + PR(tn)/C(tn))
This equation is when first time google page rank published it may possible that now google may change it.
T1 and tn are the web page that linking to web page A.
‘C’ is a number of out bound link that page t1 and tn.
“D” is damping factor normally 0.85.
In the equation 't1 - tn' are pages linking to page A, 'C' is the number of outbound links that a page has and 'd' is a damping factor, usually set to 0.85.
Page Rank use to define how important web page on the web. More the page rank more trust to that web site. When site A link to site B then Google consider that site A vote for site B.