This article extends Lau and Redlawsk's notion of correct voting – whether voters, under conditions of uncertainty, choose the alternative they would have chosen had they been fully informed about the issues and candidates in that election – to sixty-nine elections in thirty-three established and emerging democracies around the world. At the individual level, political sophistication, political experience and motivation all significantly predict the probability of casting a correct vote. However several institutional factors proved to be even more important. In particular, elections with more parties running – and settings that encourage candidate-centred voting – decrease the probability of correct voting, while more ideologically distinctive alternatives, clearer lines of responsibility and greater media access to information are associated with higher rates of correct voting.