This paper presents a reliable tool for measuring transformative learning in undergraduate social work education, the Social Work Transformation Survey (SWTS). The SWTS was developed from a qualitative theoretical model and translated into quantitative scales. The study collected data from 248 undergraduate students from eight countries who participated in a transnational project using creative journaling to facilitate transformative learning. Structural equation modelling was used to validate the internal structure of the SWTS. We then confirmed the measures' reliability, and subsequently the effectiveness of creative journaling practices as a pedagogy for facilitating transformative learning in social work students. This paper highlights the potential of combining qualitative and quantitative research approaches to develop educational evaluation tools for higher education settings and presents one specific measure for transformative learning.