The Journal Impact Factor is a very popular journal-level metric in academia. It is calculated by counting the number of citations in a given year to articles published in the journal within the 2 preceding years, and dividing that by the total number of citable publications published in the journal within the 2 preceding years.
Because the name "Impact Factor" has been trademarked by Clarivate, this metric can only be found in Journal Citation Reports (also owned by Clarivate).
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You can find a variety of journal metrics, including Journal Impact Factor (JIF or IF), for a select group of journals by searching for a journal title in Journal Citation Reports.
To find lists of journals, grouped by subject, and ranked by different journal metrics, start at Journal Citation Reports, then click "Categories" at the top of the page and narrow down to a specific group.
If you were unable to find metrics for a specific journal using Journal Citation Reports (JCR), try again in Scopus – it includes more journals than JCR (although still not all journals are listed). Also, because the term "Journal Impact Factor" is trademarked by the company that licenses Journal Citation Reports, it will not be available in Scopus.
SCImagoJR has a variety of journal metrics that are also based on Scopus citation data.
To find lists of journals, grouped by subject, and ranked by different metrics, start at SCImagoJR, then click "Journal Rankings" at the top of the page.
The h5-index and h5-median for a very limited number of journals are available in Google Scholar. (The h5-index of a journal is calculated similarly to the h-index for an author: a journal with an h5-index of 43 has published, within a 5-year period, 43 articles that each have 43 or more citations.)
Start at Google Scholar, then click the "hamburger" icon (three horizontal lines) in the upper left corner of the page, and choose "Metrics."