Google Doctype is an open encyclopedia and reference library. Written by web developers, for web developers. It includes articles on web security, JavaScript DOM manipulation, CSS tips and tricks, and more. The reference section includes a growing library of test cases for checking cross-browser and cross-platform compatibility.

Check this tool from iwebtool.com.  The results will provide a prediction of the future PageRank however this should not be considered true. The results can sometimes be known as current “real” PageRank.