Transparency is one of the key quantitative indicators of the quality of central bank communication. The more information a central bank releases about its policy, the more transparent its communication is considered to be. Globally, there are several popular indices to assess the transparency of communication. However, all of them fail to assess the transparency of central banks for the population. This paper is set to fill in this gap, which is especially important given the pivot of monetary authorities towards expanding communication with the general public. The BATI (Broader Audience Transparency Index) assesses 20 central banks in developed and developing countries in terms of the key functions of their public communication (information, education, accountability, and signalling).