The main goal of this article is to explain the bibliometric indexes of journals which are used for their evaluation. Considered are indexes calculated by the Russian Science Citation Index (RSCI) and published on the page “Analysis of journals’ publication activity”. Five types of impact factors calculated by RSCI are discussed in details. Demonstrated is the difference between impact factors based on twoyear and five-year periods. Special attention is paid to the self-citation; shown is the difference between impact factors calculated on the basis of self-citation and without it. Explained is the essence and rules of application of the new Herfindahl-Hirschman index that measures heterogeneity of companies where the authors work and spreading of journals in which articles from the journal have been cited. The Hirsch index for journals is considered. All indexes are illustrated by concrete examples.