Impact Factors

Metrics Sources

Impact Factor Chart


This guide covers the library resources central to identifying impact factors that can be used in the narrative of a promotion and tenure dossier.  It is important to remember that there is no one size fits all approach to metricsSCImago Journal & Country Rank across disciplines. Use the information that documents the impact you want to demonstrate.

Explore the areas that work best for you and schedule a consultation with Deborah Williams, Ed.D, Scholarly Communication Librarian, for additional assistance.


Note there is a glossary of terms at the bottom of this page that will help define each metric.

Impact Factors for Researchers


Source of Metrics

Total Citations



Web of Science

  • 21,000 peer-reviewed journals (including Open Access)
  • 205,000 conference proceedings
  • 104,000 editorially selected books

Sum of Times Cited 

Sum of Times Cited without self citations


Average citations per item

Citing articles

Citing articles without self citations

Scopus Preview

  • 25,000 peer-reviewed journals (including Open Access)
  • 210,000 books
Total citations by # documents h-index Document and citation trend table
Google Scholar Citations Total citations




Basic Journal Information


Journal Title Publisher Year of Publication Times Cited Peer-Review Acceptance Rate Open Access

Journal Website



Journal Citation Reports

Scopus Preview


Google Scholar

Web of Science

Other sources

Journal website




Journal website / contact editor


Journal website


Impact Factors for Journals


Source of Metrics

Impact Factor

Journal Ranking




Journal Citation Reports

  • 12,500 peer-reviewed journals (including Open Access)
  • 236 categories

Journal Impact Factor

5 Year Impact Factor

JIF Percentile

Category Median Impact Factor

Rank within category 




Scopus Preview

  • 39,000 peer-reviewed journals (including Open Access)
  • 27 major subject areas
  • 313 specific subject categories


CiteScore Ranking

SCImago Journal Rank (SJR)

SNIP (Source Normalized Impact per Paper)

Rank within category

Highest percentile



  • 27 major subject areas
  • 313 specific subject categories
SCImago Journal Rank (SJR)   Quartile h-index Citations per document
Cabell's Journal Whitelist CCI       Altmetrics
Google Scholar Metrics   Rank within category (top 20)  



Impact Factors for Monographs, Books, Book Chapters


Source of Metrics

Metrics available

WorldCat Provides holdings information for book at libraries worldwide
Various sources Book reviews
Global 50 The World Ranking of the Publishing Industry The top 50 publishing companies worldwide, based on 2018 revenue data.  Includes profile for all companies included.

Glossary of Metrics

Acceptance Rate

refers to the number of manuscripts accepted for publication relative to the number of manuscripts submitted within the last year.

Calculation varies among journals.

Altmetrics Report

overview of where and how often articles are mentioned online.  The article mentions are counted for each outlet and the median number is found.

Demonstrates how much online attention an average article is receiving.

CCI - Cabell's Classification Index

Journal ranking system based on subject. Each subject in a journal has its own percentage score built with citation data.

Demonstrates how much influence a journal has in a field of study.

CiteScore calculates the average number of citations received ina calendar year by all items published in that journal in the preceding three years.
CiteScore Percentile & Rank Source's rank and percentile for each subject category that it belongs to
CItes Per Document

Average citations per document in a X year period.  It is computed considering the number of citations received by a journal in the current year to the documents published in the X previous years.

  • 2 years
  • 3 years
  • 4 years
Difficulty of Acceptance

a journal acceptance ranking system based on subject. Each subject in a journal has its own percentage score built with citation data.

Demonstrates how hard it is to publish in a journal within a field of study.

h-index (researcher)

h publications for which researcher has received h citationsH-index chart

Researcher has 6 articles that have received at least 6 citations = h-index =6

h-index is a time-dependent measure, proportional to the length of time of a researcher's career and how many articles they have published.

h-index will vary between sources based on the number of journals included and years covered. Web of Science is not as extensive as Google Scholar and may calculate a lower h-index.

h-index (journal) h articles in that publication were cited at least h times each
h5-index h-index of only those articles that were published in the last five complete calendar years
i10-index number of papers with 10 or more citations
Journal Impact Factor identifies the frequency with which an average article from a journal is cited in a particular year.
Quartile Ranking

the quotient of a journal's rank in category (X) and the total number of journals in the category (Y), so that (X / Y) = Percentile Rank Z

Q1: 0.0 < Z < 0.25

Q2: 0.25 < Z < 0.5

Q3: 0.5 < Z < 0.75

Q4: 0.75 < Z 

Some sources only display the best quartile for journals that appear in multiple categories

SJR (SCImago Journal Rank)

expresses the average number of weighted citations received in the selected year by the documents published in the selected journal in the previous three years.  

Citation weighting depends on the subject field and prestige (SJR) of the citing journal.


Source Normalized Impact per Paper (SNIP) measures actual citations received relative to citations expected for the journal's subject field.