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Though for perfectionists, the google Adsense can be estimated through formula too.
Though there are a few offline options available one of them is the free adsense calculator
However most website owners and bloggers rely on good old online tools for the job.
Here are some of them :
Google Adsense Calculator -
Adsense Calculator Tool SEO Chat-
Google Adsense Calculator by WebKeet -
These are your options, i.e.