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Journal Metrics are used to assess quality and impact of journals. Therefore, it is important important to understand common journal metrics to help you decide the right journals for your research. The most commonly used journals metrics are journal impact factor, Altmetrics, Google Scholar Metrics, and Scimago Journal Rankings.


Journal impact factors are found in Journal Citation Reports (JCR). JCR is a unique database which is used to determine the relative importance of journals within their subject categories. Impact factor is calculated by the number of citations received by the journal, from other journals within the Web of Science database.


Impact Factor Calculation

The calculation is based on a two-year period and involves dividing the number of times articles were cited by the number of articles that are citable.

Calculation of 2018 Impact Factor (IF) of a journal:

A = the number of times articles published in 2016 and 2017 were cited by indexed journals during 2018.
B = the total number of "citable items" published in 2016 and 2017.

A/B = 2018 impact factor

Learn More About JCR

Read More About Impact Factor Metrics