The Impact Factor (also known as the Journal Impact Factor) is a proprietary product in Journal Citation Reports, owned by Clarivate Analytics (formerly Thomson Reuters).  It is a measure of the frequency with which the average article in a journal has been cited in a particular year.

Use Journal Citation Reports (JCR) to locate impact factors. The JCR also lists journals and their impact factors and ranking in the context of their specific field(s).


Note that reports on journal performance are created by publishers, and each have their own limitations. For example, not all journals from all disciplines are collected, measured and ranked in each ranking. Journals in the Arts & Humanities, for example, are not featured inside the JCR list. Alternatively, you may also use SJR (SCImago Journal & Country Rank).

It is generally inadvisable to use a ranking or measure from one database to compare it with a ranking or measure in a different database (Example: taking Journal A’s report in JCR, and comparing it to Journal B’s report in SJR, and saying that one is better than the other) because the two databases have different criteria and also different methodologies in creating their reports.

 

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