This paper estimates the production function for university students in English universities. Taking as the output the quality of a university degree and the dropout rate, we use as inputs teaching quality and quantity, entry qualifications, and the effort level. Our results uncover new findings regarding the importance of each of these elements in university performance. In particular, we find that the quality of teaching and entry qualifications affect degree performance, but not the number of hours of teaching or private study. Controlling for unobserved ability through a 2SLS/GMM estimator suggests that entry scores have no additional impact on degree performance beyond its role as a measure of student ability.