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What is an impact factor?

BMJ Journals

What is an impact factor?

What is an impact factor?
The impact factor (IF) is a measure of the frequency with which the average article in a journal has been cited in a particular year. It is used to measure the importance or rank of a journal by calculating the times its articles are cited.

What is considered a good journal impact factor?
In most fields of study a Journal impact factor (JIF) of 10 or greater is excellent and in many anything over a JIF of 3 is considered good, but it is essential to remember that JCR impact factors for journals vary markedly across disciplines.