The journal impact factor is a statistical measure used to rank and evaluate journals.
The journal impact factor is calculated by Thomson Reuters for more than 11,700 journals contained in the Web of Science database.
The information is found in Web of Science article records, and in the related InCites Journal Citation Reports database.
Scopus has introduced the CiteScore ranking, which uses a three-year window to calculate the score.
CiteScore 2016 counts the citations received in 2016 to documents published in 2013, 2014 or 2015, and divides this by the number of documents published in 2013, 2014 and 2015.
Scopus journal metrics are calculated using the Scopus database which covers more than 24,000 journals.
More information on Scopus Journal Metrics is at http://www.journalmetrics.com/sjr.php
You can use Journal Analyzer to compare up to 10 Scopus sources on a variety of parameters.