The impact factor of SCI papers refers to the ratio of the total number of citations of papers published in the previous two years to the total number of papers published in the previous two years. The range of impact factors is generally between 0- 12, and the specific range depends on the discipline, influence and citation of the journal.

For example, IF is calculated by dividing the total number of citations of papers published in SCI journals in the first two years by the total number of papers published in this journal in the first two years.