Research Article

What Is h-index? How It Works, How To Calculate It, and Where It Fails (2026)

Clear guide to what h-index means, how to calculate it, what counts as a good h-index, how it differs from impact factor, and why it is often misused.

An h-index of h means a researcher has h papers cited at least h times each. It is useful because it combines productivity and citation impact, but it is limited by field differences, career stage, database coverage, and the fact that one number cannot capture research quality.

If you searched what is h index or calculate my h index, you are probably not looking for a mathematical curiosity. You are usually trying to answer a practical question: Is my publication record competitive? How should I describe my citation impact? How do hiring committees or grant reviewers interpret this number?

The h-index is helpful, but only if you understand what it measures and what it hides.

A researcher has an h-index of h if they have h papers that have each been cited at least h times.

That sounds awkward, so here is the simple version: h-index 5 = 5 papers with at least 5 citations each h-index 20 = 20 papers with at least 20 citations each

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Frequently Asked Questions

What is h-index in simple terms?
The h-index is the number of papers a researcher has that each reached at least the same number of citations. For example, an h-index of 12 means 12 papers have at least 12 citations each.
How do I calculate my h-index?
Sort your papers by citation count from highest to lowest. Your h-index is the last rank where the paper still has at least that many citations. You can also use an h-index calculator to do this automatically.
Is h-index the same as impact factor?
No. H-index is usually used for a researcher. Impact factor is used for a journal. They describe different things and should not be treated as interchangeable.
Where can I calculate my h-index?
You can calculate it from Google Scholar, Scopus, Web of Science, or open-data tools. If you want an open workflow with paper-level breakdowns, use the [PapersFlow h-index calculator](/tools/h-index-calculator).

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