Whether or not a h-index is considered strong, weak or average depends on the researcher's field of study and how long they have been active. The h-index of an individual should be considered in the context of the h-indices of equivalent researchers in the same field of study.
In a spreadsheet, list the number of times each of your publications has been cited by other scholars.
Sort the spreadsheet in descending order by the number of times each publication is cited. Then start counting down until the article number is equal to or not greater than the times cited.
Article Times Cited
6 7 ===>h index is 6