Each and every journals has IMPACT FACTOR but those impact factor have been given by any one of the below impact factor evaluation websites
1)SCIENCE CITATION INDEX : http://www.scijournal.org/
2)Scientific Journal Impact Factor : http://sjifactor.com/
3)Universal Impact Factor : http://uifactor.org/
4)Journal Impact Factor : http://www.jifactor.com/
5)Global Impact Factor : http://globalimpactfactor.com/
6)Cite Factor : http://www.citefactor.org/journal-impact-factor-list-2014.html
and so on......
Then, why do we need all such impact factors?