Citation metrics

The citation indicator describes how often a journal's recent articles are cited. It is calculated separately from the evaluation score and is never presented as an impact factor.

The two-year citation indicator

CIY = CY ÷ (NY−1 + NY−2)
CIY
Citation indicator for year Y
CY
Citations received during year Y by eligible items the journal published in the two previous years
NY−1, NY−2
Eligible items (research articles and reviews) published in each of those years

Example

A journal published 60 eligible items in 2023 and 2024. During 2025 those items were cited 180 times. Its 2025 indicator is 180 ÷ 60 = 3.00 citations per item.

What every published indicator shows

  • The data source (OpenAlex) and the date the data was retrieved
  • The citation year and publication window
  • Which document types were counted, and the counts behind the ratio
  • The share of self-citations, and the indicator with them excluded
  • The formula version used for the calculation