Abstract: This dissertation was written to promote the author's understanding of the development of drug calculation competency in the undergraduate student nurse. It explores and critiques the literature surrounding the topic and examines the differing teaching methods that are currently used to promote this competency. Findings from the literature were compared to her experience of teaching drug dosage calculation competency to second year undergraduate nursing degree students. This dissertation suggests that drug dosage calculation may be an ongoing problem for nursing students not only during their course of study but also post registration. It appears that age and educational background may be factors in determining whether or not the student will truly master the concept. Although highly debated, it does appear that the use of a calculator assisted the nursing students within the author's class with their arithmetic operation. However, problems associated with conceptual understanding remain notable. The recommendations from this dissertation include the use of varied methods of instruction, integration of both the theory and practical components and the possible use of the dimensional analysis method in the teaching of drug dosage calculation. The author suggests that further research is required both locally within the School of Nursing where she is employed and nationally to fully examine the extent of this issue. Research which is not only focused on the student's calculation ability and its progression over the course of their study but which also allows the School to collate data on age, educational background, culture and learning style would allow lecturers to gain greater insight into student competency, progress and learning needs. She goes on to say that the continued ongoing exploration of her own practice utilising action research is also required as this would assist her in meeting the needs of students and lead to an overall improvement in her practice.