Harzin's "Publish or Perish"
Another option (less popular than the other two) to find your H-Index is Harzin's "Publish or Perish" which can be found at https://harzing.com/resources/publish-or-perish It requires you to download a program onto your device. Once you do, a chart similar to the one below appears (it might also be located on the taskbar along the bottom of your computer screen).
Type in your name and choose the source you want it to search. It will autopopulate the fields with the information gleaned from that source. To do another source, look for the word "new" and it will provide options of additional sources to search. Some of these sources (ie Scopus) are not freely available to the public and will therefore require authentication of some sort.
