Impact Factor (IF) ranks journals by measuring the number of citations its articles receive. Impact Factor is one measurement of journal credibility and hotly debated as far as usefulness.
There is a free resource, Scimago Journal and Country Rank, that provides a journal rank by SJR indicator calculations and H index. On this site you can enter the journal's title or issn to see if it is included in their list of 28,606 journals. Their Scimago journal Rank indicator (SJR) is "a measure of journal's impact, influence, or prestige. It expresses the average number of weighted citations in the selected year by the documents published in the journal in the previous three years."
