Journal Citation Indicator (JCI)

The Journal Citation Indicator (JCI) is a field-normalized citation-impact score that Clarivate calculates for every eligible journal as part of each annual Journal Citation Reports (JCR) release. Introduced in the 2021 JCR release, it was built specifically to solve a problem the Journal Impact Factor (JIF) cannot: comparing journals across very different fields on a common, discipline-adjusted scale.

How JCI is calculated

JCI measures the average citation impact of a journal’s citable items published in the most recent three-year window, then normalizes that rate against the average citation rate for all similarly-aged papers of the same document type in the same JCR subject category. The result is expressed as a simple decimal:

• 1.0 equals the world average for that category and document type, by construction.
• A JCI above 1.0 means the journal’s papers are cited more often than the category average — a JCI of 1.5 means 50% more citations than the world average for comparable papers in that field.
• A JCI below 1.0 means cited less often than the category average — a JCI of 0.5 means cited half as often.

A journal only receives a JCI if it is indexed in a JCR-eligible Web of Science Core Collection index (Science Citation Index Expanded, Social Sciences Citation Index, Arts & Humanities Citation Index, or Emerging Sources Citation Index) and has enough citable output in the relevant window for Clarivate to calculate a normalized rate.

Worked examples

Cross-field comparison. A chemistry journal with a JCI of 2.1 is performing more than twice as well, citation-wise, as the average chemistry journal of comparable age and document type. Because JCI is normalized within-category, that same 2.1 is directly comparable to a JCI of 2.1 in a completely different field — a comparison raw JIF cannot support, since JIF has no built-in cross-field baseline and raw citation rates vary enormously by discipline.

Quartile ranking basis. Since a 2024 JCR methodology change, Arts & Humanities Citation Index (AHCI) subject categories are ranked by JCI rather than JIF for their Q1-Q4 quartile assignment, because Clarivate determined JCI’s field-normalization better suits how citation practices work in humanities disciplines, where JIF-eligible citation windows and behaviors differ sharply from the sciences.

What is not a JCI score

A journal with a high raw citation count is not automatically a high-JCI journal. If a journal operates in a field with universally high citation rates, being cited more in absolute terms than a peer journal in a lower-citing field says nothing about how it compares to other journals within its own category — which is precisely what JCI, not raw citation counts or field-uncorrected JIF, is built to measure. Similarly, a journal’s CiteScore is not a JCI figure and the two are not interchangeable: CiteScore is Elsevier’s Scopus-based metric, built on different source data, coverage, and formula, and CASRAI’s CiteScore vs. Journal Impact Factor comparison covers that distinction in depth (for the Impact Factor side specifically; JCI itself has no direct Scopus equivalent).

JCI vs. Journal Impact Factor

JIF and JCI answer different questions about the same journal. JIF is a raw ratio — citations in year Y to a journal’s citable items from years Y-1 and Y-2, divided by the count of those citable items — with no adjustment for field-level citation behavior. JCI takes a similar underlying citation count but normalizes it against a category-and-document-type baseline, so a 1.0 always means “average for this field,” regardless of whether that field cites heavily (e.g. some biomedical subfields) or lightly (e.g. some humanities subfields). Both metrics are reported side by side on a journal’s JCR profile page; neither replaces the other, and Clarivate designed JCI as a complement to JIF rather than a successor. See CASRAI’s Journal Citation Reports entry for the full set of metrics a JCR release contains, and the Journal Impact Factor and Quartile Rankings guide for a fuller worked treatment of interpreting these figures responsibly.

Frequently asked questions

What does a JCI of 1.0 mean?

It means the journal’s citation impact, normalized for its subject category and document type, is exactly at the world average for comparable papers in that field over the relevant three-year window. It is a relative, not absolute, measure.

Is a higher JCI always better?

A higher JCI indicates above-average field-normalized citation impact, but like any single citation metric it should not be used alone to judge individual articles, researchers, or journal quality holistically — a caution that applies to JCI, JIF, and every other JCR-reported figure alike. CASRAI’s entry on citation impact covers this responsible-use context in more depth.

Where can I find a journal’s JCI?

On that journal’s JCR profile page within Clarivate’s JCR platform (jcr.clarivate.com), alongside its JIF, JIF 5-Year, Eigenfactor Score, and quartile rankings. JCR is a subscription product; most research university libraries provide access, often bundled with a Web of Science subscription.

How is JCI different from a journal’s quartile ranking?

Quartile ranking (Q1-Q4) is a journal’s rank position within its subject category’s full ranked list for a given metric. JCI is one of the metrics that list can be ranked by — since 2024, JCI is the ranking basis for Arts & Humanities categories specifically, while most science and social-science categories still rank primarily by JIF.