Impact factor - Wikipedia
https://en.wikipedia.org/wiki/Impact_factorIn any given year, the two-year journal impact factor is the ratio between the number of citations received in that year for publications in that journal that were published in the two preceding years and the total number of "citable items" published in that journal during the two preceding years: For example, Nature had an impact factor of 41.577 in 2017: This means that, on average, its papers published in 2015 and 2016 received roughly 42 citation…
Journal Impact Factor
impactfactorforjournal.comJournal Impact Factor List 2021. Here is the latest Impact Factor List of 2021 provided by the Journal Citation Report (JCR). It contains over 12000 Journals. JCR was earlier published as Science Citation Index, and now it is published by Clarivate Analytics, a Web of Science Group. Impact Factor Calculations