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Journal Citation Reports (JCR, under ‘J’ in Database A-Z) will help you to find out the impact factor of a specific journal as well as all journals in a subject area. Note that only SCI/SSCI indexed journals can be found in JCR.
For any journals not listed in JCR, you may try to find them in SCImago Journal & Country Rank (SJR).
Instructions on how to identify a journal’s impact factor can be found in Scholarly Communication and Research Support guide.