Research Impact Metrics

What is H-index & i10-index?

H-index & i10-index


  • The h-index is short for the Hirsch index – Jorge E. Hirsch (2005).
  • The h-index is an author-level metric that attempts to measure both the productivity and citation impact of the publications of a scientist or scholar.
  • The h-index is simply a count of the largest number of papers (h) from a journal or author that have at least (h) number of citations.
  • For instance, an h-index of 17 means that the scientist has published at least 17 papers that have each been cited at least 17 times.  If the scientist’s 18th most cited publication was cited only 10 times, the h-index would remain at 17.  If the scientist’s 18th most cited publication was cited 18 or more times, the h-index would rise to 18.


  • The i10-index is the newest in the line of journal metrics and was introduced by Google Scholar in 2011.
  • It is a simple and straightforward indexing measure found by tallying a journal’s total number of published papers with at least 10 citations.

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