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Google Analytics offers this information if you enable it.  The information is based off of Google's Double Click advertising data.  You need to update your privacy policy and make a slight alteration to your installed Google Analytics code.  This is a free upgrade to your Google Analytics Account. https://support.google.com/analytics/answer/2799357?hl=en

You should aim to be closer to 1, rather than 50. Why? Because the numbers indicate the ranking or placement of your page on the search results page(s) (SERP). Number 1 indicates a page on top of the search results page (at least for the organic search).