Prescription Refill Calculator Enter any 3 values to calculate the required value Dosage per Day Total Number of Days Medication per Refill Number of Refills Needed Calculate Reset Show Calculation Steps ▼ More Calculators28 Day Prescription Refill CalculatorLength CalculatorsRefill Date Calculator Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment * Save my name, email, and website in this browser for the next time I comment.