The journal impact factor is one number that early-career authors are told to chase — and one of the most misunderstood metrics in scholarly publishing. In plain terms, it estimates how often the average article in a journal was cited over a recent two-year window, and nothing more.
Used carefully, it is a rough signal of a journal’s citation activity. Used carelessly, it becomes a proxy for “quality” that it was never designed to measure — and a gap that fake “impact factor” services are all too happy to exploit. This guide explains what the metric is, how it is calculated, how it differs from other indicators, and how to weigh it against the things that actually shape your publishing outcome.
What is the journal impact factor and how is it calculated?
The journal impact factor is a ratio of citations to articles, measured over a fixed window. The official metric — the Journal Impact Factor (JIF) — is published by Clarivate in the annual Journal Citation Reports and is derived from the Web of Science database. Its formula is straightforward: take the number of citations received in a given year to items the journal published in the previous two years, then divide by the number of citable items (typically research articles and reviews) published in those same two years.
For example, a 2025 JIF counts citations recorded in 2025 to articles published in 2023 and 2024, divided by the count of those articles. The result is an average citations per article figure for the journal — not a score for any single paper, and not a measure of peer-review rigour. A journal earns a JIF only after Clarivate accepts it for indexing, which is a separate, selective process from simply being a legitimate, peer-reviewed publication. Many sound, well-run journals are not indexed in Web of Science and therefore have no official JIF at all — which does not, on its own, say anything about the rigour of their review or the value of their research.
How does the JIF differ from CiteScore, SJR, and the h-index?
They measure related but distinct things, and they are not interchangeable. Treating them as one “impact number” is a common mistake. Here is how the main metrics compare:
- Journal Impact Factor (JIF) — Clarivate, based on Web of Science, two-year citation window. The metric most people mean by “impact factor.”
- CiteScore — published by Elsevier and based on the Scopus database, using a four-year window. It generally covers more journals than the JIF and produces different values, so the two are not comparable one-to-one.
- SJR (SCImago Journal Rank) — also Scopus-based, but it weights citations by the prestige of the citing journal, so a citation from a highly ranked source counts for more.
- h-index — originally an author-level metric (a scholar with an h-index of 20 has 20 papers cited at least 20 times each) that is sometimes applied to journals. It rewards sustained output, not a recent two-year average.
Because each metric uses a different database, window, and weighting, a journal can look strong on one and modest on another. Always note which metric a number refers to before comparing journals.
How can I spot a fake or unofficial impact factor?
Be sceptical of any “impact factor” that is not the Clarivate JIF, because a whole industry of unofficial services sells impressive-looking numbers for a fee. These operations — often with names deliberately echoing well-known indexes — issue certificates and inflated scores that carry no scholarly recognition. Their metrics are not derived from Web of Science and are frequently used by predatory publishers to appear credible.
To protect yourself, apply a few checks. Confirm whether a JIF claim can be verified in Clarivate’s Journal Citation Reports rather than only on the journal’s own homepage. Be wary of vague phrases such as “global impact factor” or “universal impact factor” with a suspiciously high value. And weigh citation claims alongside verifiable signals of legitimacy — a transparent double-blind peer-review process, registered ISSNs, and real DOI registration. IJARST, for instance, is UGC-approved, runs double-blind review by two experts, and registers DOIs through CrossRef; you can review its indexing and standards on the indexing and standards page and read published work in the article archive.
What does the impact factor NOT tell you about a paper?
It tells you almost nothing about the quality of an individual article. This is the single most important thing an author can understand about the metric. The JIF is a journal-level average, and citations are highly skewed — a small number of heavily cited papers can pull a journal’s average up while most articles are cited far less. Publishing in a high-JIF journal does not make your specific paper highly cited, and a strong paper in a lower-JIF or specialist journal can still earn substantial citations and readership.
The metric is also blind to several things that matter to authors: it says nothing about the fairness or speed of peer review, the reach of your paper within your specific field, whether the work is open access, or its real-world application. Fields differ enormously in baseline citation rates too, so a “good” impact factor in a fast-moving biomedical area looks very different from one in a niche engineering subfield. Comparing raw JIFs across disciplines is rarely meaningful.
How should an early-career author weigh impact factor against other factors?
Treat impact factor as one input among several — not the deciding vote. For most early-career researchers, the practical goal is to place sound work in a legitimate, well-matched journal that will actually be read by the right audience. When you evaluate a venue, balance the metric against:
- Fit — does your topic and method genuinely match the journal’s scope and readership? A well-matched specialist journal often serves your work better than a higher-JIF general one.
- Legitimacy — verifiable peer review, real ISSNs, DOI registration, and a named publisher. IJARST carries print ISSN 2319-1783 and online ISSN 2320-1126 and is published by Pearl Media Publications Pvt. Ltd.
- Speed and process — a transparent, timely review process matters for graduation, funding, and job timelines.
- Access and cost — open-access reach can widen your readership; understand any article processing charge up front. IJARST charges no submission fee and an APC of INR 1,600 / USD 50 only after acceptance.
For a fuller framework on balancing these trade-offs, see our guide on how to choose the right journal for your research paper. The impact factor deserves a seat at the table — just not the whole table.
Understanding what the journal impact factor really measures helps you read metrics critically, avoid fake-index traps, and choose a journal for the right reasons. If your work is ready for a legitimate, open-access, peer-reviewed home, you can submit your manuscript to IJARST when the fit is right.
