Journal metrics illustrate the impact of a journal on its field. Metrics do not translate into "quality" but they are indicative of importance. They should always be used in conjuction with other evaluative tools to determine a journal's quality.
JCR offers subject rankings (ecology, political science, women's studies, etc.) The rankings can be sorted by total cites, impact factor and Eigenfactor. It can be customized to include cited half-life, immediacy index and other indicators as well. Individual journals can also be profiled by a variety of data between 1997 and the present.
Information is available by discipline, with journal titles ranked within that discipline. Searching by individual titles is also an option but the context is best seen discipline-wide. CWTS Journal Indicators offers SNIP indicators (which stands for "source normalized impact per paper") which correct for differences in citation rates between scholarly disciplines and journal sizes. For instance, although the field of Mathematics has much lower citation rates than the field of Molecular Biology, the importance of specific journals in different fields can be compared because the SNIP adjusts according to citation practices in each field.
CWTS Journal Indicators is freely available from Leiden University's Centre for Science & Technology Studies (CWTS). The statistics are based on Scopus database citation information. It provides rankings for science, social science, and arts & humanities titles, but journal title coverage is weighted towards the sciences, as is Scopus.
Scimago offers subject rankings at two levels of specificity: the broader areas (chemistry, social sciences) and the more specific categories (ceramics & composites or education.) The rankings can be sorted by a wide variety of statistics, including Scimago Journal Ranking (SJR), H-index, and citable documents. Individual journals can also be profiled by a variety of data between 1999 and the present.
Scimago also has visualization options in the Viz Tools segment and country ranking information as well.
The Eigenfactor subject categories are drawn from the JCR subject categories but do not exactly duplicate them, as each journal belongs to only one category. Rankings of journals within each category are available. Journal specific rankings are also available. Three ranking scores are offered at this site: the Eigenfactor score, the Normalized Eigenfactor Score and the Article Influence score.
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