Just was curious that is there a way from which i can check that how much traffic a web site or blog has and how much is that site earn, this could help in making a site or one could have a guess what kind of trend there is.
After you have an Adsense account, google.com/adsense will show your ad views as well as clicks and earnings. However, all visitors may not give you ad views because of many factors like ad not showing on mobile website, etc. So for exact web traffic you can use Google Analytics.
Like Maninder said, you can integrate your adsense Google analytics account with adsense, that is the best way of knowing how much you earned and also what the traffic source was, incase you wish to advertise your site further.
You can see the trends by checking the topics on their website but about the traffic and adsense earning, its difficult to guess.