Direct comparison
CiteScore vs Impact Factor Compared
CiteScore vs Journal Impact Factor: citation window, denominator, and database differences — and why the same journal ranks differently in each.
Side-by-side comparison
| Dimension | CiteScore | Journal Impact Factor |
|---|---|---|
| Who calculates it | Elsevier | Clarivate |
| Source database | Scopus | Web of Science Core Collection (via Journal Citation Reports) |
| Citation window | 4 years — citations in year Y to documents published in Y, Y-1, Y-2, Y-3 | 2 years — citations in year Y to citable items published in Y-1, Y-2 (a JIF 5-Year figure is also published) |
| What counts as “citable” (denominator) | Broad — articles, reviews, conference papers, data papers, and more, counted the same way in numerator and denominator | Narrow — articles and reviews only ("citable items") |
| Access / cost | Free at scopus.com/sources, no subscription required | Requires an institutional/library JCR subscription for full figures; indexing status is checkable free via the Web of Science Master Journal List |
| First introduced | 2016 (methodology revised 2020) | JCR first published 1975 using 1974 data; the underlying concept dates to Eugene Garfield’s work at ISI in the 1950s–60s |
| Journal eligibility | Any Scopus-indexed serial title | Through the 2022 JCR release: SCIE/SSCI-indexed journals only. From the 2023 release: all Web of Science Core Collection journals, including ESCI and AHCI titles |
| Subject-category scheme for quartiles | Elsevier's All Science Journal Classification (ASJC), ~330 categories | Web of Science subject categories (254 categories as of the 2026 JCR release) |
| Trademark / brand ownership | Elsevier trademark | Clarivate trademark |
| Typical context of use | Free cross-database comparison; increasingly referenced outside North American biomedical contexts | Still the most commonly requested figure in North American and biomedical tenure/grant contexts, despite DORA critique |
Common questions
FAQ
Can a journal have a high CiteScore but a low Journal Impact Factor, or vice versa?+
Yes, routinely. Because CiteScore uses a longer four-year citation window and a broader set of citable document types than JIF's two-year, articles-and-reviews-only window, the two metrics can diverge meaningfully for the same journal — that's expected, not an error in either database.
Is CiteScore the same as SJR or SNIP?+
No. CiteScore, SJR (SCImago Journal Rank), and SNIP (Source-Normalized Impact per Paper) are all computed from Scopus data but use different formulas — CiteScore is a direct citation-to-document ratio, SJR applies PageRank-style prestige weighting, and SNIP normalizes for field-level citation behavior.
Which metric should I report in a tenure or grant application?+
Check what the specific funder, journal, or promotion committee actually asks for — many biomedical and North American contexts still default to JIF, while CiteScore is increasingly referenced elsewhere. Per DORA, neither should be used as a stand-in for the quality of an individual article or researcher regardless of which is requested.
Do CiteScore and JIF quartiles for the same journal always match?+
No. Quartiles are built from different subject-category schemes (Elsevier's ASJC for CiteScore vs Web of Science categories for JIF) on top of the different underlying metric, so a journal can rank Q1 in one system and Q2 or lower in the other.
