h is the number of articles greater than h that have at least h citations.
For example, h-index = 20 means that there are 20 items that have 20 citations or more.

This metric disregards the weight of few extremely often cited papers and of papers which were not or almost not cited so far.
In contrast to the usual journal impact factor (IF), it considers true citations of the respective papers, not those of the journal.
A known bias of the h-index is that it usually grows with scientific age of the researcher.
The h-index was developed by J.E. Hirsch and published in PNAS 102 (46): 16569-16572, 2005 [PubMed] [WebPage] [PDF].

The values given for researchers on our homepage are based on Web of Science using Orcid as primary identifier.

How to determine the personal h-index:
Step 1: Get a list of your publications from a data base (we recommend Web of Science)
Step 2: Sort your papers in decreasing order of citations.  
            Take care to manually opt out name look-alikes. To avoid such errors you may use your Orcid ID.
Step 3: Go down the list to the last paper which has a higher (or equal) number of citations than the rank of that paper.
            The rank of that paper is your h-index.

Practical example, assumed for a total of 5 own papers:
Rank 1 = 9 times cited paper
Rank 2 = 6 times cited paper 
Rank 3 = 4 times cited paper  :-)
Rank 4 = 3 times cited paper  :-(
Rank 5 = 1 times cited paper
      h-index = 3

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