For most of the last fifty years, when a researcher asked "is this a good journal?" the implicit answer was "what is its impact factor?" That single number, calculated annually by Clarivate's Journal Citation Reports, has shaped tenure decisions, grant evaluations, and submission strategies across nearly every discipline. In 2026 it remains useful, but it is no longer the only — or even the best — way to evaluate a venue. This guide walks through the modern journal metrics that complement (and in some contexts replace) the classic impact factor, and explains when to reach for which one.
Why Impact Factor Alone Is Insufficient
The impact factor is the average number of citations received in a year by papers published in the previous two years. Three structural problems make it a noisy signal:
- Two-year window is too short for many fields. Mathematics, ecology, and theoretical physics often see papers gather citations over five to ten years. A two-year window systematically undervalues these disciplines.
- One outlier paper can dominate the score. A single highly-cited paper can pull a journal's impact factor up by 30 percent or more. The number tells you about the journal's average, not your individual paper's likely fate.
- The metric is not normalized across fields. A journal with IF 4 is elite in mathematics and middling in clinical medicine. Comparing across disciplines is meaningless.
None of this means impact factor is useless. It means it is one data point in a richer toolkit.
CiteScore (Scopus)
CiteScore is Elsevier's competing metric, calculated annually for journals in the Scopus database. Unlike impact factor, it uses a four-year citation window, which makes it less volatile and more representative for slower-citing fields. It is also free to look up, where impact factor requires a JCR subscription.
When to use it: as a more stable companion to impact factor, especially in fields where citations accumulate slowly. CiteScore is published annually and listed on most journal pages.
SCImago Journal Rank (SJR)
SJR is built on the same principle as Google's PageRank algorithm: a citation from a well-cited journal is worth more than a citation from an obscure one. It is calculated from Scopus data and published freely on the SCImago Journal & Country Rank site.
When to use it: when you want a metric that accounts for the quality of the citing journals, not just the raw count. SJR is particularly useful for cross-disciplinary comparison because it normalizes against subject category averages.
Source Normalized Impact per Paper (SNIP)
SNIP, developed at Leiden University, normalizes citations against the citation behavior of the source field. A citation in a field where most papers cite 50 prior works is worth less than a citation in a field where most papers cite 10. This makes SNIP the most field-comparable of the major journal metrics.
When to use it: when you need to compare journals across very different disciplines and want a single number that adjusts for field-specific citation density. Funders and tenure committees are increasingly using SNIP for exactly this reason.
Journal h-index
The h-index, originally proposed for individual researchers, also works at the journal level. A journal has h-index h if it has h papers each cited at least h times. Unlike impact factor, the journal h-index rewards consistent productivity over the entire history of the journal rather than a two-year snapshot.
When to use it: when you want to assess a journal's long-term track record rather than its current momentum. Useful for evaluating older, established journals where impact factor may have plateaued or fluctuated.
Field-Weighted Citation Impact (FWCI)
FWCI is an article-level metric, not strictly a journal metric — but it is the most useful number for evaluating where your specific paper stands. It compares a paper's citations against the average for papers of the same age, type, and subject field, expressed as a ratio. An FWCI of 1.0 means your paper is being cited at exactly the field average; 2.0 means twice the average; 0.5 means half. It is calculated by Scopus and Dimensions and is the metric most commonly used by modern research evaluators.
When to use it: always, for individual paper assessment. It bypasses the journal-level averaging problem entirely.
Altmetrics
Altmetrics measure the broader online attention a paper receives — mentions in news outlets, policy documents, blog posts, Wikipedia, and social media. They are not a substitute for citation metrics, but they capture impact that citations miss, particularly for clinical, policy-relevant, and public-facing research. The Altmetric "donut" you see on many journal pages is the most common implementation.
When to use it: when your work has societal or policy implications and citations alone undersell its real-world reach.
How To Combine These Metrics In Practice
For most researchers, the practical workflow is:
- Use SJR or SNIP as your primary single-number indicator of a journal's standing within your field. Both are free and field-normalized.
- Cross-check with CiteScore for stability. If a journal's CiteScore moves in the same direction as its impact factor over three years, the trend is real.
- Look at the journal's h-index if you want to see whether it has a long track record or whether its current numbers are propped up by a single hot year.
- Use FWCI to evaluate the specific papers you cite, your own publication record, and the typical performance of papers similar to yours within a candidate journal.
- Use altmetrics as a tiebreaker when the citation metrics put two journals roughly equal and you want to know which one reaches a broader audience.
The Quiet Shift Underway
Funders and tenure committees are slowly moving away from impact factor as the dominant signal. The Declaration on Research Assessment (DORA), signed by more than 20,000 institutions and individuals, explicitly recommends against using journal-level metrics to evaluate individual papers or researchers. The replacement is not a single new metric — it is the kind of multi-signal, paper-level evaluation described above. The researchers who get ahead of this shift now will find their grant applications and tenure files easier to defend in five years. Use Journals Hub's metrics filters to compare candidate journals across all of these dimensions side by side.