5 Year Impact Factor & Ranking

4.0 3.0 2.0 1.0 3.751 2017 2018 2019 2020 2021 3.751 2017 2018 2019 2020 2021
  • 1 135
    #51
  • 1 277
    #108
  • 1 137
    #52
  • 1 283
    #112
  • 1 138
    #55
  • 1 296
    #125
  • 1 142
    #58
  • 1 327
    #152
  • 1 139
    #60
  • 1 341
    #163

About 5 Year Impact Factor & Ranking

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

Metrics

Year I.F. Engineering, chemical Materials science, multidisciplinary
2021 3.751 60/139 163/341
2020 58/142 152/327
2019 55/138 125/296
2018 52/137 112/283
2017 51/135 108/277

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.