The issue of determining the growth of a portal based on network externalities of their business model is not easy.  In a business where the growth model of its users is linear, usually it grows very slowly.  In a business type marketplace (where supply and demand, such as Solostocks.com) They are growths of between 12% and 15% per month (geometric) in a business network type (eg Linkedin) growths are much stronger and can exceed 20% monthly geometric. 
In this regard, when I worked in Intercom I wrote an article that may be of interest: Why free content raises the billing? ( OGame)

Returning to the subject of calculating the income of a portal, if we are able to extrapolate the growth in the number of users of our online service, with this tool we can have a potential clue to the billing page.  So you can help us get more realistic business plans when the portal business model is based on selling advertising. 

Now it remains to verify that the tool is reliable, of course. 

I'll do some testing for a few months in a couple of portals and then publish the results in this blog. 

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https://www.montsepenarroya.com/wp-content/uploads/2013/09/Valor-Google.jpg485759Peñarroya Montserrathttps://www.montsepenarroya.com/wp-content/uploads/2017/09/MP-Logo-Web-1.pngPeñarroya Montserrat2012-09-12 09:57:552012-09-11 20:12:13Tool that calculates the value of a website

I believe that all these pages are similar.  Some have separate data and other less interesting.  I to add to the list that is present here add http://trevia.es .  It would be nice an article in which each site was analyzed and the estimated value and the actual value is seen.  For example I searched the police insignia and left me winning only 47 euros per month which obviously should not be the case.  I think these pages are very close if you type adsense advertising models but not if you have an online business. 

Thanks Joan, Hypestat think it takes the data from Alexa ranking and from there extrapolates the number of website visits.  The other: Trafuka seems more a web of spam ... I would not use it, Hypestat itself.  So thanks for the comment.  A hug.