Calculating the H-index involves ranking a researcherâs publications in descending order of citation count. The H-index is the point at which the number of citations is greater than or equal to the rank number. For example, if a researcher has 10 papers with the following citation counts: 50, 45, 40, 30, 25, 20, 15, 10, 5, 1, the H-index would be 7 because the 7th paper has 15 citations, which is greater than or equal to 7.