This book develops proficiency in working out calculations commonly encountered in pharmacy practice. This book is structured around a five-lesson design that provides numerous practical examples and problems, enabling instructors to extract complementary classroom material and student to use the book at their own pace in preparing for the national pharmacy licensure examination. Practice problems (with the answers provided) are included at the end of each lesson, and knowledge is tested with 100 practice problems and explanations at the end of the book. Written by a clinician in easy-to-understand and humorous language, this book illuminates the relevance of calculation to pharmacy practice.