Journal ranking is widely used in academic circles in the evaluation of an academic journal's impact and quality. Journal rankings are intended to reflect the place of a journal within its field, the relative difficulty of being published in that journal, and the prestige associated with it. They have been recently introduced as official research evaluation tools in some countries such as Norway, Australia, France, and Denmark. 
Several journal-level metrics have been proposed, most citation-based:
- Impact factor – Reflecting the average number of citations to articles published in science and social science journals.
- Eigenfactor – A rating of the total importance of a scientific journal according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals.
- SCImago Journal Rank – A measure of scientific influence of scholarly journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from.
- h-index – Usually used as a measure of scientific productivity and the scientific impact of an individual scientist, but can also be used to rank journals.
- Expert survey – A score reflecting the overall quality and/or contribution of a journal is based on the results of the survey of active field researchers, practitioners and students (i.e., actual journal contributors and/or readers), who rank each journal based on specific criteria.
- Publication power approach (PPA) – The ranking position of each journal is based on the actual publishing behavior of leading tenured academics over an extended time period. As such, the journal’s ranking position reflects the frequency at which these scholars published their articles in this journal.
- Altmetrics – Rate journals based on scholarly references added to academic social media sites.
- diamScore – A measure of scientific influence of academic journals based on recursive citation weighting and the pairwise comparisons between journals.
Several countries rank national and international journals, e.g.:
- ERA Australia journal lists
- Brazil's Qualis
- Colombia's Publindex
- Norwegian Scientific Index
- DHET List of Approved South African Journals
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- Danish Ministry of Higher Education and Science (2014)""
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