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Journals that are indexed in the article database Web of Science are ranked using a tool known as the Impact Factor, which is based on the previous two years' citation data.
Impact Factors are best used to compare journals in the same subject category, as citation rates vary widely between disciplines. For example, Nature has an Impact Factor of over 40, while American Historical Review has a factor which is below 2, yet each is ranked first in their subject category.
Ranked subject categories are divided into quartiles, with Q1 identifying the most-cited journals.
Web of Science gives a quick overview of a journal’s Impact Factor, rank and quartile in the relevant subject category. The overview may not be available for all journals.
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Last updated on Tuesday 25 June 2019
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