How to Calculate g-Index: Step-by-Step Guide

Updated 11 November 2026 · Standard formula, shown below

This guide explains how to calculate the g-index, a bibliometric measure that assesses the impact of a researcher’s publications. You will need a list of your publications sorted by citation count, and the steps below will show you how to compute your g-index manually or with a spreadsheet.

What You’ll Need

A complete list of your publications (or the set you want to analyze).
Citation counts for each publication (from Google Scholar, Scopus, Web of Science, or your own records).
A calculator or a spreadsheet program (like Excel or Google Sheets) for convenience.

Step-by-Step

List your publications – Write down each publication you want to include. Typically, this is all your published works, but you can restrict it to a specific time period or field if you wish.
Find the citation count – For each publication, record how many times it has been cited. Use a consistent source (e.g., Google Scholar) so all counts are comparable.
Sort in descending order – Arrange the publications from the most cited to the least cited. This is crucial because the g-index is based on the top n papers.
Create a table – Make a table with columns: Rank (1, 2, 3, …), Publication, Citations, and Cumulative Citations. The rank is the position in the sorted list (1 for the most cited).
Calculate cumulative citations – For each row, add the citations of that row to the total from the previous rows. For example, if the top paper has 50 citations and the second has 30, the cumulative for rank 2 is 80.
Find the largest g such that cumulative citations ≥ g² – Look down the cumulative column. For each rank g, check if the cumulative citations are at least g² (g squared). The g-index is the largest g that satisfies this condition.
Interpret the result – The g-index is that largest g. For instance, if you have 20 papers with cumulative citations of 400, then g = 20 because 20² = 400. If the 21st paper brings the cumulative to 410, but 21² = 441, then g remains 20.

Common Mistakes

Not sorting correctly – The list must be sorted in descending order (highest citations first). If you sort ascending, your g-index will be wrong.
Using total citations instead of cumulative – The condition uses cumulative citations, not the citation count of the g-th paper alone. For example, if the 10th paper has 100 citations but the cumulative is only 90, g cannot be 10 because 10² = 100 > 90.
Including non-publications – Only count published works (articles, books, proceedings). Exclude unpublished drafts, reports, or self-citations if you prefer a stricter measure.
Rounding errors – When using a calculator, ensure you compare cumulative citations to g² exactly, not rounded values.

Tips

Use a spreadsheet to automate the cumulative calculation. In Excel, if your citations are in column B, in C2 enter =B2, and in C3 enter =C2+B3, then drag down.
You can quickly estimate g by taking the square root of the total citations. For example, if you have 1000 total citations, the g-index is at most 31 (since 31² = 961). But the actual g may be lower because the top papers must have enough citations.
If you have a very high number of publications, you can stop the calculation when the cumulative citations fall below the square of the current rank – no need to go further.
Compare your g-index to your h-index: the g-index is always larger than or equal to the h-index. This gives a sense of the impact of your top papers.

Troubleshooting

My g-index seems too low – Check if you have included all your publications. Missing high-citation papers can drastically reduce the g-index. Also, verify that you sorted correctly.
My g-index seems too high – Ensure you are not counting citations from self-citations or from non-peer-reviewed sources if you want a more conservative measure. Also, check that you haven’t included duplicate entries.
I have a paper with zero citations – That’s fine. It will appear at the bottom of the list. It can still contribute to the cumulative total, but it won’t help increase g because the cumulative grows slowly.
The cumulative citations are not adding up – Double-check your addition. If you are using a spreadsheet, make sure the formula references the correct cells.
Different sources give different citation counts – This is normal. Google Scholar tends to count more citations than Scopus or Web of Science. Pick one source and stick with it for consistency.

Frequently Asked Questions

What is the difference between h-index and g-index?

The h-index is the largest h such that h papers have at least h citations each. The g-index is the largest g such that the top g papers together have at least g² citations. The g-index gives more weight to highly cited papers.

Can the g-index be calculated for a single paper?

No, the g-index is defined for a set of papers. For a single paper, the g-index would be 1 if the paper has at least 1 citation, but that doesn’t provide meaningful insight.

What is a good g-index?

There is no universal threshold. It depends on the field, career stage, and publication rate. In physics, a g-index of 20 might be good, while in social sciences it could be lower. Compare with peers in your field.

Does self-citation affect the g-index?

Yes, self-citations count toward the citation total. Some researchers exclude self-citations to get a more objective measure. You can choose to include or exclude them, but be consistent.

How do I calculate the g-index in Excel?

Sort your citations descending. In column C, compute cumulative sums. Then in a new cell, use the formula =MAX(IF(C1:C100>=ROW(1:100)^2, ROW(1:100))) entered as an array formula (Ctrl+Shift+Enter in older Excel). This returns the largest rank where the condition holds.

Can the g-index be greater than the number of publications?

No, the g-index cannot exceed the total number of publications. If you have 10 papers, the maximum g is 10, because you cannot have more than 10 papers in the top g.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.