The h-index can be calculated for journals as well as authors. The value h is the largest number where at least h articles in that publication were cited at least h times each. 

For example, a journal with 10 articles cited 51, 17, 11, 9, 8, 4, 2, 1, 0 and 0 times has an h-index of 5. There are 5 articles in this publication that have been cited 5 or more times. 

Google Scholar calculates the h5-index, which considers only publications and citations from the last 5 years. The h5-index provides the advantage of currency compared to overall h-index. Google Scholar also provides the h5-median, which takes the median of the h-core, or the articles with more citations than the h-index. In the example above, the h-core is 8, 9, 11, 17, and 51. The median would be 11. 

Scimago Journal & Country Rank also publishes h-indexes for journals, based on Scopus citation data.

1. Open Google Scholar.

2. Select Metrics from the hamburger menu at the top left.

3. Browse by category and subcategory or search for a specific publication.

4. Find the h5-index and h5-median metrics for your journal. 

1. Open Scimago Journal & Country Rank.

2. Search for the journal title and open the record.

3. The h-index is displayed prominently on the right.