The journal impact factor calculates the frequency with which the “average article” in a journal has been cited in a particular year. It shows the significance or rank of a journal.
The impact factor (IF) can help evaluate a journal’s relative importance, especially compared to other journals in the same field.
To calculate the IF, divide the number of citations of articles published in the journal during the most recent two years by the total number of articles published in the same period.
The equation is as follows: 2022 Journal Impact Factor = A/B
- A = the number of articles published in 2020 and 2021 that were cited by indexed journals in 2022
- B = the total number of citable items published in 2020 and 2021
In this definition, “citable items” are articles, reviews and proceedings papers. It does not include editorials, corrections, notes, retractions and discussions.
The Journal Impact Factor publishes as part of the Journal Citation Report based on the Web of Science source data.