5 Year Impact Factor & Ranking

3.0 2.25 1.5 0.75 2.837 2017 2018 2019 2020 2021 2.837 2017 2018 2019 2020 2021
  • 1 150
    #88
  • 1 231
    #122
  • 1 155
    #88
  • 1 236
    #139
  • 1 159
    #91
  • 1 241
    #149
  • 1 159
    #92
  • 1 264
    #162
  • 1 169
    #93
  • 1 270
    #179

About 5 Year Impact Factor & Ranking

Impact Factor based on 5 years of history. Copyright Clarivate Analytics.

Metrics

Year I.F. Ecology Environmental sciences
2021 2.837 93/169 179/270
2020 2.684 92/159 162/264
2019 2.076 91/159 149/241
2018 2.145 88/155 139/236
2017 2.042 88/150 122/231

Definition

Impact Factor

A base of five years may be more appropriate for journals in certain fields because the body of citations may not be large enough to make reasonable comparisons, or it may take longer than two years to publish and distribute leading to a longer period before others cite the work.

Actual value is intentionally only displayed for the most recent year. Earlier values are available in the Journal Citation Reports from Clarivate Analytics.

ISI ranking

Journals are often ranked by Impact Factor in an appropriate Clarivate Analytics subject category. As there are now two Impact Factors published – two-year and five-year Impact Factors – this rank may differ, so care is needed when assessing these ranked lists to understand which of the two metrics is being used. In addition, journals can be categorized in multiple subject categories, giving them different ranks for each subject. Consequently, a rank should always be in context to the subject category.