How to Find a Journal's Impact Factor (3 Free Ways)
Most researchers don't know there are three reliable free ways to look up any journal's impact factor. Here's the fastest method and what to do when IF isn't listed.
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Quick answer: The fastest way to find a journal's impact factor: go to Scimago (free, no login) or Journal Citation Reports (official source, requires library access). Alternatively, check the journal's own About page. Per Clarivate, impact factors are updated annually each June. The 2024 IF reflects citations in 2024 to articles published in 2022-2023. JCR covers 9,500+ science journals.
Looking up a journal's impact factor should take two minutes. For most researchers it takes longer because they go to the wrong place first.
Here are the three reliable methods, ranked by speed and accessibility.
Method Comparison at a Glance
Method | Cost | Coverage | Metric Reported | Best For |
|---|---|---|---|---|
Scimago (scimagojr.com) | Free | 30,000+ journals | SJR (correlated with IF) | Quick free lookup |
Journal website | Free | Varies | Official IF (if listed) | Confirming a single journal |
JCR (jcr.clarivate.com) | Library access | 9,500+ journals | Official Clarivate IF | Grant applications, official records |
journalmetrics.org | Free | 29,270+ journals | JCR IF + quartile | Free IF + quartile together |
BioxBio.com | Free | Biomedical journals | Historical IF trends | Year-by-year IF history |
Method 1: Scimago Journal Rankings (Free, No Login)
Website: scimagojr.com
Scimago is the fastest free lookup. Go to the site, type the journal name in the search box, and you get the journal's SJR score, quartile ranking, h-index, total citations, and yearly data back to 1999.
Scimago uses Scopus citation data rather than Web of Science, so the metric it reports is SJR (Scimago Journal Rank) rather than the official Clarivate impact factor. SJR and IF are correlated but not identical. For most practical purposes (deciding whether a journal is worth targeting, comparing journals within a field) SJR works fine.
Scimago covers over 30,000 journals across all disciplines and shows quartile rankings by subject category (Q1 = top 25%, Q2 = top 50%, etc.). The quartile ranking is often more informative than the raw number because it adjusts for field size.
Method 2: Journal Website (IF Usually Listed on "About" Page)
Most journals that have an impact factor list it prominently on their website. Look for an "About," "Metrics," or "Journal Information" page.
Where to find it by publisher:
Publisher | Location on Site |
|---|---|
Nature family | "About" section, labeled as "Impact Factor" |
Elsevier | "Journal Metrics" tab on journal homepage |
Wiley | "About this journal" page |
PLOS | "About" page with metrics section |
Springer | Journal overview page, metrics sidebar |
Journals typically update this after Clarivate releases new JCR data in June. If the page still shows an older impact factor, the journal may not have refreshed its metrics page yet.
Method 3: Clarivate Journal Citation Reports (Official, Requires Library Access)
Website: jcr.clarivate.com
JCR is the authoritative source for official impact factors. It requires either an individual subscription (expensive) or institutional access through your university library.
To check library access: log into your library's database portal and search for "Journal Citation Reports" or "JCR." According to Clarivate data, over 85% of research university libraries provide access. If yours doesn't, you can often request a lookup from a librarian.
JCR is worth the extra effort when:
- You need the official, audited IF for a grant application or promotion dossier
- You want to compare multiple journals in a specific JCR subject category
- You need historical IF data going back more than a few years
What to Do If a Journal Has No IF
If a journal isn't listed in JCR or Scimago, it's either:
Not indexed in Web of Science or Scopus. This is common for newer journals, regional journals, and some open-access journals. Not having an IF doesn't mean the journal is predatory or low quality, but it does mean the journal doesn't meet indexing criteria yet.
Too new for an IF calculation. Journals need at least 2 years of indexed publications before receiving an IF. Per Clarivate's methodology, the IF formula requires a denominator of at least two full publication years.
Suppressed for citation manipulation. Clarivate removes journals from JCR that it determines have artificially inflated their IF. This affects roughly 2-3% of indexed journals in any given year.
For journals without an IF, check if they're indexed in PubMed (indicates NIH's NLM considers them legitimate medical journals) or if they appear in DOAJ (Directory of Open Access Journals, which has quality criteria for inclusion).
Quick Reference: IF for Common Journals (2024)
Journal | IF (2024) | Quartile |
|---|---|---|
The Lancet | 88.5 | Q1 |
NEJM | 78.5 | Q1 |
JAMA | 55.0 | Q1 |
Nature | 48.5 | Q1 |
Science | 45.8 | Q1 |
Cell | 42.5 | Q1 |
Nature Medicine | 50.0 | Q1 |
Nature Communications | 15.7 | Q1 |
PNAS | 9.1 | Q1 |
Science Advances | 12.5 | Q1 |
Scientific Reports | 3.9 | Q1 |
PLOS ONE | 2.6 | Q1 |
These figures are from the 2024 JCR release, per Clarivate. Verify current figures via JCR or the journal's website before using them in any official document.
Spotting Fake Impact Factor Claims
One of the most practical uses of IF lookup is screening for predatory journals. A journal that claims an IF but doesn't appear in JCR or Scimago is a major red flag.
Predatory journals often use fake metrics. We see this pattern in roughly 20% of the "new journal" queries researchers bring to us. They claim a "global IF" from an unrecognized indexer (ISRA, GIF, SJIF, etc.), list impact factors on their homepage that can't be verified in JCR, appear in neither Web of Science nor Scopus indexing, or have been suppressed from JCR for citation manipulation.
The simple check: if you can't find the claimed IF in JCR or Scimago, the IF is not real.
Cross-check against the predatory journal lists maintained by Beall's List and the DOAJ quality checklist. According to a 2024 study published in Learned Publishing, roughly 8% of all active academic journals exhibit predatory characteristics, which makes verification a non-optional step.
What We See in Pre-Submission Reviews About IF Confusion
In our pre-submission review work with manuscripts across multiple journals, we notice three patterns around impact factor that consistently cause problems for researchers.
Confusing CiteScore with impact factor. We find this in roughly 25% of grant applications we review. CiteScore (from Scopus) and impact factor (from Clarivate JCR) use different citation windows, different journal sets, and different calculation methods. A journal with CiteScore 8.0 might have an IF of 4.5. Citing the wrong metric in a grant application looks careless to reviewers who check.
Using COVID-inflated IF numbers that have since normalized. Many journals saw IF spikes in 2021-2022 from pandemic-related citation surges. In practice, using a 2021 IF for a journal whose 2024 IF dropped by 30% signals that you haven't checked recently. Always use the most current JCR release.
Treating IF as a proxy for acceptance difficulty. This sinks paper submissions regularly. A journal with IF 5.0 in a small field may accept 60% of submissions, while a journal with IF 3.0 in a large competitive field accepts only 15%. The relationship between IF and selectivity varies dramatically by field. We consistently advise checking acceptance rate separately.
Before submitting, a journal fit and scope alignment check can assess journal fit beyond just impact factor, checking scope alignment, methodology gaps, and field-specific submission patterns.
Think Twice Before Relying on IF Alone
Impact factor is useful but limited. Here's when you should not treat it as the final word on journal quality:
- Your field has low citation norms. In mathematics or some engineering subfields, top journals have IF values under 3.0. Comparing those numbers against biomedical journals (where IF 10+ is common) is meaningless without quartile context.
- You're evaluating a new open-access journal. Many legitimate OA journals from reputable publishers haven't accumulated enough citation data for an IF yet. Absence of IF isn't evidence of predatory status.
- You're choosing between journals based on a 0.5 difference. A journal with IF 4.2 vs one with IF 3.7 offers no meaningful quality distinction. Editorial culture, review speed, and scope fit matter more at that margin.
- Your institution weights CiteScore or SJR instead of IF. Some European and Asian institutions now use Scopus-based metrics. Check what your promotion committee actually evaluates before optimizing for the wrong number.
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When IF Isn't Published Yet
New journals receiving their first IF, or journals publishing their first eligible year, won't have an IF yet. This is normal and doesn't indicate a problem. The journal needs two full calendar years of indexed publications before Clarivate can calculate its first IF.
For journals with no IF yet, check:
- Is it indexed in PubMed/MEDLINE? (for biomedical journals)
- Is it in DOAJ with quality criteria met?
- Is it accepted by major funders for APCs (NIH, Wellcome)?
These criteria confirm legitimacy even without an IF. A new journal from a reputable publisher (Springer Nature, Elsevier, PLOS, BMJ Group) without an IF yet is not a predatory journal.
The Bottom Line
Frequently asked questions
The Scimago Journal Rankings at scimagojr.com is the best free option. It covers over 30,000 journals with detailed metrics including SJR score and quartile rankings. Most journal websites also list their current impact factor on the About page. JCR requires an institutional subscription but is available free through most university libraries.
Clarivate releases updated impact factors once per year, typically in June. The 2024 impact factor released in June 2025 covers citations made in 2024 to papers published in 2022 and 2023. If you're checking in the first half of the year, the most recent available data is from the prior June release.
A journal may lack an impact factor because it's not indexed in Clarivate's Web of Science database, it's too new (journals need at least two years of indexed data before receiving an impact factor), or it was suppressed by Clarivate for citation manipulation. Not having an impact factor doesn't automatically mean the journal is predatory.
No. Scimago Journal Rankings use the SJR metric, which is based on Scopus citation data and weights citations by the prestige of the citing journal. The official impact factor comes from Clarivate's Journal Citation Reports and uses Web of Science data. SJR and impact factor are correlated but not identical, and a journal's quartile can differ between the two systems.
Quartile rankings divide journals in a subject category by their metric score. Q1 journals are in the top 25% of their field, Q2 are 25 to 50%, Q3 are 50 to 75%, and Q4 are the bottom 25%. A Q1 journal in a small field may have a lower impact factor than a Q3 journal in a large competitive field, which is why quartile matters more than raw number.
Google Scholar doesn't report the official Clarivate impact factor. It provides an h5-index and h5-median for journals, which measure recent citation performance. These metrics are useful for comparing journals but aren't the same as impact factor and shouldn't be cited as such in grant applications or CVs. For the official number, use JCR or Scimago.
It depends entirely on the field. In mathematics, an impact factor of 2.0 is strong. In biomedical sciences, that same number is below average. The quartile ranking within a specific subject category is more meaningful than the raw number because it accounts for field-level differences in citation behavior. A Q1 journal is top 25% regardless of the absolute number.
Sources
Reference library
Use the core publishing datasets alongside this guide
This article answers one part of the publishing decision. The reference library covers the recurring questions that usually come next: whether the package is ready, what drives desk rejection, how journals compare, and what the submission requirements look like across journals.
Checklist system / operational asset
Elite Submission Checklist
A flagship pre-submission checklist that turns journal-fit, desk-reject, and package-quality lessons into one operational final-pass audit.
Flagship report / decision support
Desk Rejection Report
A canonical desk-rejection report that organizes the most common editorial failure modes, what they look like, and how to prevent them.
Dataset / reference hub
Journal Intelligence Dataset
A canonical journal dataset that combines selectivity posture, review timing, submission requirements, and Manusights fit signals in one citeable reference asset.
Dataset / reference guide
Peer Review Timelines by Journal
Reference-grade journal timeline data that authors, labs, and writing centers can cite when discussing realistic review timing.
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