We have been using "Google Analytics" Tool for investigate, this is the smart tool for can analysis all think of traffic to incoming website like as: traffic source, user Country, Time. It is also showing in a graph figure in a every date wise.
Google Analytics is the place where you can measure actual traffic to any website.
Also, What Google Analytics provides is an estimate in the end.
So ensure that you take the data in as just a guess and not an actual metric.
For see website traffic google provide a free tool Google Analytics, where you can check traffic on daily bases, type of audience, traffic source, which location you get traffic, on which query and page, which time, and also you can check expected traffic on the search so that you can target them also.
You can also check out audience behavior based on their search query, how many sessions they visit, and what kind of action they do on the website, wherefrom they come.