Examples
Worked examples
- Is an instance
Journal page citation: Human Molecular Genetics, Journal Impact Factor 3.1 (2025, Clarivate), as reported on the Oxford University Press journal page, read 7 November 2026.
Editorial commentary
Quick answer: The Journal Impact Factor of Human Molecular Genetics (ISO abbreviation Hum Mol Genet) is 3.1 for the 2025 data year, with a 5-year Journal Impact Factor of 3.6. Both figures are the ones Oxford University Press publishes on the journal’s own About page, where they are credited to Clarivate; CASRAI read them there on 7 November 2026. Other sites list 3.2 for the same year, so name the source and the data year whenever you cite the number.
What is the impact factor of Human Molecular Genetics?
Human Molecular Genetics is published by Oxford University Press (online ISSN 1460-2083). Its journal page describes it as committed to the communication of high quality studies related to human molecular genetic disease mechanisms, covering topics such as the genetic basis of disease, cancer genetics, neurogenetics, therapy, genome-wide association studies and model systems relevant to human genetics. The journal page reports an impact factor of 3.1 (2025, Clarivate) and a 5-year impact factor of 3.6 (2025). The human molecular genetics impact factor is therefore a journal-level figure for the 2025 Journal Citation Reports release, not a property of any single paper in it.
How the figure is calculated
Clarivate defines the Journal Impact Factor as the citations received in the JCR year to items the journal published in the previous two years, divided by the number of citable items (articles and reviews) published in those two years. Editorial material, letters and meeting abstracts are not counted in the denominator. The 5-year version uses the same ratio over five years of publications, which is why a journal’s two figures differ. For the full method see how the Journal Impact Factor is calculated, and for where to find a current value see how to look up a journal’s impact factor. The official source is Journal Citation Reports, which is subscription-based.
Quartile and category rank
A single impact factor places a journal differently in each subject category. The journal page gives these 2025 category ranks:
| JCR category | Rank | Position in category | Quartile (derived) |
|---|---|---|---|
| Genetics & Heredity | 74 of 192 | 38.5% from the top | Q2 |
| Biochemistry & Molecular Biology | 192 of 328 | 58.5% from the top | Q3 |
The journal page states the ranks but not the quartiles; the quartile column is CASRAI’s arithmetic (rank divided by category size: up to 25% is Q1, up to 50% Q2, up to 75% Q3). The same impact factor of 3.1 therefore reads as Q2 in one category and Q3 in the other, so a quartile claim should always name the category.
Other metrics reported for the journal
The journal page also reports, for 2025, a CiteScore of 7.2 with ranks of 22 of 100 in Genetics (clinical), 85 of 357 in Genetics and 134 of 414 in Molecular Biology; a cited half-life of 12 years; 1,520,847 full-text uses; and a median of 10 days from submission to first decision. CiteScore (Elsevier, Scopus) is much higher than the impact factor of 3.1 because it is a different metric: it uses a different citation window and a different database and document-type rules, so the two numbers cannot be compared directly.
Hum Mol Genet versus Hum Genet
Hum Mol Genet is the standard abbreviation for Human Molecular Genetics (Oxford University Press). Hum Genet is the abbreviation of a different journal, Human Genetics, from another publisher, with its own separate impact factor. Searches for “hum genet impact factor” return that other journal’s value, which must not be read as the figure above.
Using the number responsibly
An impact factor describes how a journal’s recent articles were cited on average; citation distributions are skewed, so it says little about any one paper, and it should not stand in for judging the work itself. Funders and institutions that follow responsible-assessment principles such as DORA advise against using journal-level metrics to evaluate individual researchers. Cite the number with its data year, its source and the date you read it. For the same treatment of another journal, see the Scientific Reports impact factor entry.
Sources
- Oxford University Press, Human Molecular Genetics About page, academic.oup.com/hmg/pages/About, read 7 November 2026.
- Clarivate, Journal Impact Factor definition, InCites Indicators Handbook (incites.help.clarivate.com) and the JCR Reference Guide.
Machine-readable encodings
Use in your systems
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