This app will help healthcare students and professionals to develop and consolidate their drug calculations skills. The topics covered by the app follow a flexible simple-to-complex sequence of calculations starting with the basic solid and liquid calculations and calculations with different units to the more complex calculations of drug percentages and drip and infusion rates. Within each topic there are worked examples showing you how to perform the calculations, which are followed by interactive exercises to enable you to practice your skill. Each topic finishes with a mini-quiz to enable you to self-assess your ability to perform the calculations. The topics can either be accessed in order from start to finish or on their own if only a refresher is needed.