There are many types of journals metrics that take in consideration data coming from two sources.
1. Web of Science, index database including more than 11,000 journals and is published by Clarivate Analytics.
2. Scopus, index database including over 22,000 journals and it is published by Elsevier.
Additionally, Google Scholar metrics ranks the top 100 publications in several languages, ordered by their five-year h-index and h-median metrics. Journal ranking within the research areas and subcategories is also available but only for the English publications.
Impact factor is the number of citations made in the current year to articles in the previous 2 years, divided by the total number of citable articles from the previous 2 years.
Where to find Journal Impact Factor?
Other journal metrics available in JCR are:
Important readings about journal impact factor
The journal impact factor was designed to help librarians decide which journals to subscribe to and was never intended as a measure of scholars' value. Cons for being used in scholars' evaluation include:
Although outside its scope, journal impact factor became part of scholars' evaluation criteria in many cases. Consequently, there is growing concern on the extent of this practice and growing support for its demise as a scholars' evaluation criteria.