Clarivate Analytics releases the Journal Impact Factors annually as part of the Web of Science Journal Citation Reports. Clarivate Analytics released two types of Impact Factor.
1. 2 Year Impact Factor and
2. 5 Year Impact Factor.
Impact Factor
A journal impact factor is a calculation based on a two-year period and is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years.
5-Year Impact Factor
The 5-year journal impact factor is the average number of times articles from a journal published in the past five years have been cited in the chosen JCR year.
The impact factor of a journal is calculated by dividing the number of current year citations to the source items published in that journal during the previous two years. It is denoted as a ratio between citations and recent citable items published.
Hi Nehad, There is an article on this on the Clarivate website - Google doesn't know everything! Find it here [ https://www.researchgate.net/post/How_JIF_percentile_of_a_journal_is_calculated ]. Also remeber that the web is full of fake metrics for predatory journals so the Clarivate website is the only reliable source of infomnation on this topic. BW Matt
Dear Nehad Ali Shah,
JIF percentile of a journal is calculated "Method for Converting JIFs to Percentiles via Excel's Percentrank Function". Appendix: Using Microsoft Excel to Calculation PIFs by the link: http://www.istl.org/09-spring/refereed1.html
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