Journal Citation Reports (JCR) offers a systematic, objective means to critically evaluate the world's leading journals, with quantifiable, statistical information based on citation data. By compiling articles' cited references, JCR Web helps to measure research influence and impact at the journal and category levels, and shows the relationship between citing and cited journals.
JCR is available in Science and Social Sciences editions and can be found here.
For information for new users click here.
The journal impact factor of a journal is the average number of times articles from the journal published in the past two years have been cited in the JCR year.
The impact factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years.
An impact factor of 1.0 means that, on average, the articles published one or two year ago have been cited one time. An impact factor of 2.5 means that, on average, the articles published one or two year ago have been cited two and a half times.
Citing articles may be from the same journal; most citing articles are from different journals.
ITC offers access to the JCR Science Edition and the JCR Social Sciences Edition.
When to use
To find which journals are important in a certain subject field.