Meta-analysis is a powerful yet underused tool in cognitive science. It allows researchers to leverage entire bodies of literature to get a broad and quantitative overview of a particular phenomenon, thereby promoting theory development, and to make more precise estimates of effect sizes, which enables robust planning of prospective studies (e.g. through power-analyses). In this tutorial, we will introduce meta-analysis as a tool with which to inform everyday research, and provide participants with hands-on experience conducting their own meta-analysis. We will also present an online platform we have developed for conducting meta-analyses in the field of language development: MetaLab (http://metalab.stanford.edu).