Metered-dose and dry-powder inhaler days supply from labeled actuations, puffs per dose, and daily use. PRN sigs require your entered maximum puffs per day.
Enter the quantity dispensed and how much the patient uses per day. The calculator converts the sig into daily use, then divides the dispensed amount to give days supply with the full worked math.
This page is one of the days-supply calculator hub tools. Related drug math: ProAir inhaler days supply, and Trelegy inhaler calculator. Compare the Tablets & capsules calculator. Then use the refill due-date calculator or browse tools hub.
Divide the total quantity dispensed by the amount the patient uses per day. The hard part is converting the sig into a daily amount first: milliliters per day, puffs per day, drops per day, units per day, or grams per day.
Yes. Every Allied Health Academy pharmacy tool is free to use, with no account required, and shows the step-by-step math so you can check your own work.
These tools are built for pharmacy technician training and exam practice. Always verify the result against the prescription, the product label, and your pharmacist before billing a claim.
For educational purposes only — consult the pharmacist or prescriber. This tool computes days supply from the quantity and directions you enter. It does not recommend doses, diagnose, or determine insurance eligibility.
These calculators are free. If you are studying for the PTCB exam, we also publish paid study products and a PharmD-led certification program. Founders pricing is $499 through December 2026.