h-index in Google Scholar and Scopus: what is the difference
The h-index in Google Scholar and Scopus often differs because these systems index different volumes of publications and citations. Google Scholar usually shows broader coverage, while Scopus reflects a stricter and more structured selection.
In detail
Many authors compare their metrics across systems and wonder why the numbers differ. This is normal: the databases operate on different principles.
Google Scholar
Google Scholar indexes a large body of scholarly content from the internet: journal articles, conference materials, dissertations, repositories, manuscripts on university websites, and sometimes different versions of the same work.
Because of this, Google Scholar often shows
- more publications;
- more citations;
- a higher h-index.
Scopus
Scopus operates more strictly: it includes only selected sources, uses its own author profiles, and counts citations within its own database.
As a result, in Scopus an author usually has
- fewer publications;
- fewer citations;
- a more conservative h-index.
What this means in practice
You cannot simply take a number from Google Scholar and expect it to match Scopus. This is not necessarily an error or a profile problem. Most often it is a result of different indexing policies.
What to use
- Google Scholar is useful for broad visibility and a general view of citation impact.
- Scopus is more often used for formal analytics, reporting, and evaluation of indexed publications.
What is important to remember
If the h-index in Google Scholar is higher than in Scopus, this is a normal situation and not by itself a sign of an error.