jats:p This article considers the potential and limits of quantitative approaches to labour law research. It explores the methods used to construct and validate indicators of labour regulation (‘leximetrics’) and those used in the econometric analysis of the effects of labour law rules on employment, productivity and inequality. It is argued that while there is a risk of the misuse and misappropriation of legal indicators, they can provide new evidence on the nature and effects of labour law rules, and thereby contribute to labour law theory as well as to the resolution of some practical issues of regulatory policy. </jats:p>