Acknowledging that what teachers believe informs how they teach we argue the importance of understanding, at both entry and exit, teacher education students’ beliefs about mathematics, mathematics teaching and themselves as learners of mathematics. In this paper we report on the development and trial of a simple to use online survey instrument focused on uncovering teacher education students’ mathematics-related beliefs. Twenty items, targeted on a range of constructs reported in the literature, were set against five point Likert scales. The instrument was found to be reliable and an exploratory factor analysis yielded seven interpretable belief dimensions. The interactions of these dimensions allude to groups of student likely to prove problematic during their programme.