Citation Impact Factor Calculator
Calculate a journal-style impact factor by dividing recent citations by recent publications over a defined window.
Impact Factor
4.000
Impact Factor vs Citations This Year to Articles in Window
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.
- 01Impact factor: 320 / 80 = 4.000
- 02Articles per year: 80 / 2 = 40.0
常见问题
Who calculates official impact factors?
Clarivate Analytics calculates the official Journal Impact Factor (JIF) published in Journal Citation Reports.
Can impact factor be gamed?
Yes, through editorial self-citation, review articles, and publication timing. This is why multiple metrics should be used.
Is a higher impact factor always better?
Not necessarily. Niche fields have lower citation rates. A specialized journal with IF 2.0 may be top-tier in its field.