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Research metrics and publishing: Journal Impact Factor / Journal Rank

Key journal metrics

Journal metrics allow researchers to rank or compare journals through the use of citation data. Key journal metrics such as JIF (Journal Impact Factor) are commonly used by authors to guide decisions about which journals to aim for when submitting articles for publication.
In addition, researchers may wish to contact their Faculty's Research Office for advice on recommended journals in their discipline.

Journal Impact Factor

Journal Impact Factor (JIF) is calculated annually for selected publications indexed in Web of Science Core Collection. JIF is a proprietary resource access via the library. JIF cannot be used to compare across different disciplines. Use JIF when you want to determine quality based on Journal Impact Factor or journal ranking within a field.

JIF = the number of times articles published in the previous 2 years have been cited in the year of reporting, divided by the number of citable items.


CiteScore is calculated monthly based on Scopus citation data. CiteScore includes all types of documents (conference proceedings, letters etc.) rather than just research papers and reviews. Use CiteScore when you need an alternative to JIF, or you want to include a range of documents that are indexed in Scopus.

CiteScore = the number of times documents published in the previous 3 years have been cited in the year of reporting, divided by the number of documents.

SJR Scimago

SCImago JournalRank (SJR) is a ranking based on the transfer of prestige from one journal to another based on Scopus citation data. Calculations are similar to those of Journal Impact Factor but are normalised for fields that don't cite much, and citations are weighted on the prestige of the citing journal. Scimago is a free resource available at

Use Scimago when a Journal Impact Factor is not available, or when investigating across different fields and a publication is indexed in Scopus.


SNIP (Source Normalized Impact per Paper) is the ratio of a source's average citation count per paper and the 'citation potential' of its subject field. SNIP is based on Scopus citation data and allows direct comparison of sources in different subject fields.

Use SNIP when you want to account for variations in citing patterns within disciplines or are investigating across different fields, and publications are indexed in Scopus.

Discipline specific journal rankings / quality lists