Page rank is measure to calculate rank of a website. It could be blank, 0, 1, 2 upto 1o. 10 is maximum page rank. It has many criterias and a lot of factors are considered while calculating this rank. To get page rank of a website there are online tools where by entering website name page rank can be checked. Also, by installing addons on a toolbar in browser or browser addons page rank can be checked.
Many addons and websites are available on internet which provides this data quickly and for free. Perform a search for get page rank on search engine and you will get many websites where a page rank can be checked.