SCImago Journal Rank vs Impact Factor: Which Journal Metric Matters More?

When evaluating journals, researchers encounter two major ranking systems: the Journal Impact Factor (JIF) from Clarivate and the SCImago Journal Rank (SJR) from Elsevier. Both measure journal influence through citations. But they do it through fundamentally different approaches, with different databases, different citation windows, and different levels of sophistication. Knowing when each is more appropriate — and why they sometimes give very different answers for the same journal — makes you a significantly better-informed researcher.

What Is SCImago Journal Rank?

SCImago Journal Rank is a metric developed by SCImago Lab, based on Scopus citation data, and freely available at scimago.org. It covers approximately 27,000 journals.

SJR is a prestige-weighted citation metric. Unlike impact factor, which treats all citations equally, SJR weights each citation by the influence of the journal from which it comes. A citation from Nature contributes more to a journal’s SJR than a citation from a low-circulation regional journal. This approach borrows from the same mathematical logic as Google’s PageRank algorithm — influence flows through citation networks, and being cited by influential sources matters more than simply being cited many times.

Additionally, SJR excludes journal self-citations entirely, removing a known gaming strategy that inflates JIF scores.

What Is Journal Impact Factor?

The Journal Impact Factor is published by Clarivate Analytics through the Journal Citation Reports, based on Web of Science data, and available via institutional JCR subscription.

JIF measures the average number of citations received per citable article (original research and reviews only) published in a journal during the preceding two years. It treats all citations equally — a citation from any Web of Science indexed journal counts the same — and includes self-citations in the numerator. It covers approximately 21,000–22,000 journals.

Head-to-Head Comparison

Feature	SCImago Journal Rank (SJR)	Journal Impact Factor (JIF)
Published by	SCImago Lab (Elsevier)	Clarivate Analytics
Database	Scopus	Web of Science
Citation window	3 years	2 years
Citation weighting	Prestige-weighted (source quality matters)	Equal weight (all citations same)
Self-citations	Excluded	Included
Journal coverage	~27,000	~21,000–22,000
Cost to access	Free (scimago.org)	Subscription required (JCR)
Available since	1999 (expanded 2007)	1975
Document types in denominator	Articles and reviews	Articles and reviews

You can also read our guide on Impact Factor vs CiteScore to compare another widely used journal metric. 

Why Prestige Weighting Matters

Consider two journals:

Journal A: Cited 600 times per year, primarily by journals in small regional research communities

Journal B: Cited 250 times per year, primarily by Nature, Cell, Science, and other top-tier journals

By raw citation count logic (JIF approach), Journal A appears more influential. By SJR’s prestige-weighted logic, Journal B ranks higher because its citations come from sources that are themselves highly influential in the citation network.

This distinction matters for detecting journals that inflate their rankings through coordinated citation rings within clusters of lower-influence journals — a real phenomenon that JIF calculations can fail to detect.

The Self-Citation Difference

JIF includes self-citations in the numerator. If a journal’s articles frequently cite other articles in the same journal, those citations contribute to the JIF. This creates a known gaming opportunity: editors can encourage authors to cite the journal’s own recent papers, directly inflating the JIF.

SJR excludes self-citations entirely. A journal cannot improve its SJR by encouraging authors to cite the journal’s own work. This makes SJR more resistant to this specific form of manipulation.

A journal with a notably higher JIF than SJR (relative to other journals in the same category) may be generating a significant proportion of its JIF through self-citations.

When SJR and JIF Give Different Answers

For most major, well-established journals, SJR and JIF tell broadly consistent stories. Both will rank Nature, The Lancet, and Cell near the top of their respective fields.

Divergence tends to occur in specific situations:

Review journals: JIF tends to rate review journals highly because reviews attract many citations quickly. SJR’s prestige weighting partially corrects for this by weighting citation source quality.

Self-citation heavy journals: Journals with high self-citation rates will show higher JIF than SJR, relative to their actual standing in the broader citation network.

Regional journals: Journals with strong regional citation networks but limited international reach may have artificially high JIFs relative to their SJR, because their citations come from sources that are themselves not highly influential.

New journals: SJR’s 3-year window captures more citations for newer journals than JIF’s 2-year window, giving newer journals a slightly stronger SJR than JIF in their early years.

Accessing SJR on Scimago.org

SCImago Journal & Country Rank is freely available at scimago.org. For any journal:

1. Search by journal name or ISSN
2. View the SJR score for each year — higher = more influential in the citation network
3. View the quartile ranking (Q1–Q4) within each subject category
4. Check the h-index for the journal
5. See historical trend charts showing whether influence is growing or declining
6. Identify all subject categories the journal is assigned to

The quartile ranking at SCImago is particularly useful because it immediately contextualises the raw SJR score within the journal’s specific field.

Which Should You Use?

For tenure and promotion packages: JIF is more universally recognised. Most evaluation committees and funding bodies are more familiar with JIF. Use JIF as your primary metric, with SJR as a supplement if it adds relevant information.

For journal discovery and shortlisting: SJR at scimago.org is the best free starting point. Broader coverage, prestige weighting, self-citation exclusion, and easy free access make it more practical for preliminary journal research.

For journals not indexed in Web of Science: SJR may be the only available major metric for Scopus-indexed journals that lack a JCR impact factor.

For cross-field comparisons: SJR’s prestige weighting provides a somewhat more level playing field between fields than raw JIF, though SNIP (Source Normalised Impact per Paper) is even better for cross-field comparison.

For detecting potential gaming: A large gap between JIF and SJR for the same journal (specifically, JIF much higher than SJR relative to field peers) warrants investigation. It may indicate high self-citation rates or citation network manipulation.

Best practice: Check both. Consistent high standing across JIF and SJR provides independent confirmation from two different databases and methodologies.

Practical Examples: When SJR and JIF Tell Different Stories

Example 1: The high self-citation journal

Journal X has JIF 6.5 and SJR 1.2 within its subject category. Its field peers have JIF 5–8 and SJR 1.8–2.5. This pattern — JIF in the normal range but SJR notably lower — often signals high self-citation. Checking the JCR self-citation rate reveals it is 28% — nearly one in three citations in the journal’s impact factor comes from the journal citing itself. The SJR, which excludes self-citations, shows a more accurate picture of external influence.

This journal is still legitimate, but its JIF slightly overstates its external community influence relative to its peers.

Example 2: The rising open-access journal

Journal Y launched in 2018 as a fully OA journal in environmental science. It has no JIF yet (JCR requires two full citation years and an application process that can take several more years) but has CiteScore 4.2 and SJR 0.9, placing it solidly Q2 in its Scopus categories. Its h-index is 35 after 6 years.

By JIF standards, this journal “doesn’t have an impact factor” — which some researchers interpret as a quality problem. By SJR and CiteScore, it is a legitimate Q2 journal that simply hasn’t yet received a JCR impact factor assignment.

This example illustrates why relying exclusively on JIF misses a significant portion of the journal landscape.

How to Use Both Metrics in Your Publication Strategy

For established journals (indexed in both WoS and Scopus)

Check JIF (via JCR or the journal’s website) alongside SJR (scimago.org). Use JIF for formal evaluation reporting; use SJR to identify whether the JIF appears authentic or potentially inflated.

Consistent story: JIF 8, SJR 2.1 (Q1 in SJR among field peers) — the journal is genuinely strong.

Inconsistent story: JIF 8, SJR 0.8 (Q3 in SJR among field peers) — investigate the discrepancy before committing a submission. Check self-citation rates in JCR.

For journals not indexed in Web of Science

If a journal has Scopus indexing but no JIF, SJR is your primary metric. A Q1 SJR journal without a JIF is still a legitimate Q1-level venue. In formal reporting, present the SJR and quartile clearly and note that JCR indexing is pending or not applicable.

For truly new journals (less than 3 years old)

Neither SJR (requires 3 years) nor JIF (requires 2+ years plus application) may be available. Evaluate on: editorial board calibre, publisher reputation, COPE and OASPA membership, DOAJ listing, and early citation patterns of published papers.

Useful guides for researchers preparing to submit

These PubScholars resources cover the full journal selection and submission process: 

How to Choose the Right Journal for Your Paper — a practical framework for matching scope, audience, and impact factor to your manuscript 

How to Publish a Research Paper — the complete step-by-step guide from manuscript prep to post-publication promotion 

Impact Factor vs CiteScore: Which Matters More? — how the two metrics differ and when to use each 

Does Impact Factor Affect Manuscript Acceptance Chances? — what IF signals about desk rejection rates and submission strategy 

Which Journals Have the Highest Impact Factor? — field-by-field rankings across medicine, biology, chemistry, and physics 

Frequently Asked Questions

Is SJR more reliable than impact factor? 

Neither is categorically more reliable. SJR is more methodologically sophisticated — it excludes self-citations and weights citations by source prestige. JIF is more institutionally recognised. For detecting potential metric gaming, SJR is more reliable. For communicating your record to institutional evaluators, JIF is typically more appropriate.

Why does my journal have a much higher JIF than SJR suggests it should? 

A significant gap (JIF much higher than SJR relative to field peers) most commonly indicates: high self-citation rates, membership in a coordinated citation network, or an outsized contribution of highly-cited editorial content to the numerator. Check the JCR self-citation rate for the journal.

Is scimago.org reliable? 

Yes. SCImago is a research group from the Consejo Superior de Investigaciones Científicas (CSIC) in Spain, operating since 2007. The data is based on Scopus, a major peer-reviewed database. The methodology is published and transparent.

Can I use SJR quartile instead of JIF quartile in grant applications? 

In most cases yes, especially for journals indexed in Scopus but not JCR, or in fields where Scopus coverage is stronger. Check the specific funder’s requirements — most accept either. When in doubt, present both.

Conclusion

SCImago Journal Rank and Journal Impact Factor measure journal influence through different approaches: SJR uses prestige-weighted citations from a 3-year window, excluding self-citations, from the Scopus database. JIF uses equal-weighted citations from a 2-year window, including self-citations, from Web of Science. For most major journals, both tell broadly similar stories. For journals where they diverge significantly, the divergence itself is informative. The most effective researchers use both as complementary tools, understanding what each measures and what each misses.