The key journal metric (also known as journal impact factor) is based on the # number of articles published in a given journal, and numbers of times articles have been cited over time (e.g., 2 years). Some metrics aim to account for other aspects of citations, including:
For a description of how it is possible to game journal metrics, see Editors’ JIF-boosting stratagems – Which are appropriate and which not?
Acceptance and circulation rates are not available for every journal, but can be useful metrics in determining the relative importance of particular journals.
Thomson Reuters' Journal Citation Reports (JCR®) provides the Journal Impact Factor, the best known journal metric.
Connect: Journal Citation Reports
Source data: Journal Citation Reports provides the impact factor, immediacy index, Eigenfactor metrics, and other citation data for approximately 12,000 scholarly and technical journals and conference proceedings from more than 3,300 publishers in over 60 countries in the Science Citation Index Expanded and Social Science Citation Index in the Web of Science Core Collection. Journals listed exclusively in Arts and Humanities Citation Index are not included.
Also available: ranked lists of journals in Subject Categories (e.g. History, Forestry, Pathology), based on journal impact factor.
Thompson Reuters provides excellent training videos and documentation .
Connect: Freely available here.
Source database: more than 22,000 journal and book series titles from Scopus/SciVal
Search by journal or book series title, subject area, publisher.
Source data: Scopus/SciVal
Also available: lists of journals, in broad or narrower subject areas, ranked by SJR, H-Index, total cites, etc.
Connect: Google Scholar Citations
Source data: Citations present in Google Scholar from a five year period ending one year ago. For example, in August, 2015, Google Scholar Citations includes citations from articles published between 2010 and 2014. More details.
See Google Scholar Metrics for definitions.
Also available: ranked lists of Top 100 Publications for journals published in a number of languages including English, French and Chinese. For English-language publications, additional Top 100 Publications lists are available for broad disciplines (e.g. Social Science), and for subcategories of the broad disciplines, e.g. Family Studies.
Source data: from Web of Science, with a 6 month delay
Methodological details here.
(Note that both EF and AI scores are available in Journal Citation Reports, calculated over the previous 3 years.)
Also available: ranked lists of journals in the same Field Categories as Journal Citation Reports (e.g. History, Forestry, Pathology), based on Eigenfactor® Score.
More information: About Eigenfactor
Source database: Scopus/SciVal