Are you thinking about becoming a registered nurse? If yes, then you must be familiar with dosage calculation. Did you know with some school you must get 100% on the dosage calculation test. What is dosage calculation? Dosage calculation in nursing is the precise mathematical process of determining the correct amount of medication to administer based on a provider’s order, patient factors, and available drug concentration. It is critical for patient safety, ensuring accuracy to prevent overdosing or underdosing. In this course, I will go over the three main methods for dosage calculation: dimensional analysis, ratio and proportion, and formula method.