The “h-index” was introduced in 2005 by the American physicist, Professor Jorge Hirsch in his article “An index to quantify an individual’s scientific research output as a mean to measure both the scientific productivity and the apparent scientific impact of a scientist.
The H-index is relatively effective in comparing researchers working in the same scientific field, and not comparable across disciplines due to different publishing and citation patterns.
The h-index is based on a list of publications ranked in descending order by the Times Cited. The value of h is equal to the number of papers (N) in the list that have N or more citations.
Ex. An h-index of 10 means that there are ten papers that have ten or more citations.
Calculated automatically in subscription-based databases
Each database is likely to produce a different h for the same scholar, because of different coverage.
Access Web of Science
Enter scientist's name in the author search box
Add limits (field, year, affiliation, etc) to get results for the right person
Click on Search
Click on Citation Report on the right hand corner of the results page – the h-index is on the right of the screen
NOTE. Web of Knowledge was found to have strong coverage of journal publications, but poor coverage of high impact conferences.
For nonsubscribers, the publisher of Scopus, Elsevier, provide Scopus Preview: Author Free Lookup, that gives the author's h-index (calculated from 1996 data to the present only), and the number of times this individual was cited in the Scopus database (you cannot see which of the author's articles are being cited, nor which articles are doing the citing).
Manually calculated in databases that provide citation information
Free tools to calculate h-index