Thomson Reuters Journal Citation Reports (JCR) is the official source of Journal Impact Factors™. Unfortunately, it requires a subscription and the CORE Library does not yet subscribe.
However, information can also be found in other places:
SCImago Journal Rank (SJR) This tool uses Scopus journal information to allow users to search and analyze journal and country rankings.
Eigenfactor Scientific journals are rated by the number of incoming citations, where citations from more highly ranked journals make a greater contribution to the eigenfactor than citations from more poorly ranked journals. The score was developed at the University of Washington by Jevin West and Carl Bergstrom.
European Reference Index for the Humanities ERIH is developed by and for European-language researchers.
Google Scholar Metrics explore publications by subcategories. Journals are ordered by their five-year-h-index and h-median metrics. Click here to see the top 100 publications.
Harzing's Publish or Perish The software program uses Google Scholar to retrieve and analyze academic citations to present statistics on citations, journal metrics, and author metrics.
Source Normalized Impact per Paper (SNIP) Using the Scopus database, SNIP is “ calculated as the number of citations given in the present year to publications in the past three years divided by the total number of publications in the past three years.” For more information, seeCWTS Journal Indicators.
Tip: Most high-level journals report their most recent impact factor on their website. One need only verify the impact factor. A good source of free journal rankings and metrics is Scopus's CiteScore, which measures average citations received per document published in the serial.