期刊影响力计算器 — 公式

How Journal Impact Factor is Calculated

The impact factor (IF) measures how frequently articles from a journal are cited.

Formula

IF = Citations in Current Year to Articles Published in Prior Window / Total Articles in Window

The standard window is 2 years. A journal that published 80 articles in 2 years and received 320 citations to those articles has an IF of 4.0.

Context

  • IF > 10: High impact
  • IF 3-10: Good impact
  • IF 1-3: Moderate impact
  • IF < 1: Lower impact

    • 计算示例

    A journal published 80 articles in the last 2 years and received 320 citations to those articles this year.

    1. Impact factor: 320 / 80 = 4.000
    2. Articles per year: 80 / 2 = 40.0