Google SERP is a mysterious monster that changes dinamically based on many factors: your location, the keywords you tape, the Google url extension (.com, .fr, .es, etc.), your IP address, your cache, your gmail account preferences (yes if you are logged in google customizes the search result page for you), etc.
It is impossible to list all the factors that have an impact on the SERP and it is even harder to foresee how Google modifies the result page based on the combination of influencing factors.
Therefore you cannot perform the old school manual check of going to Google, search for the targeted keyword and look where your website ranks.
SEO is all about keywords so your website will probably rank differently depending on the searched keyword; there is not an absolute website ranking.
How to calculate the keyword ranking
How to calculate the keyword ranking Your website will have a unique ranking associated to each specific keyword, how to calculate it? First you need to calculate the keyword potential in terms of average monthly searches generated; this can easily be done with the Google keyword planner.
So let’s say we want to calculate the ranking of iLovePage1 for the keyword “search engine optimization software”. The keyword generates 590 average monthly searches on Google:
The last two major CTR studies were conducted by Optify and Enquiro. Optify’s study was conducted in the holiday season of 2010 from a variety of business-to-business websites. The study published by Enquiro Search Solutions was conducted in 2007 using survey data and eye-tracking research. It was the result of a business-to-business focused survey of 1,084 pre-researched and pre-selected participants. Both studies observed Google as its search engine; the CTR curves for each study are shown below.