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Free pharmacy technician day supply calculator. Calculate prescription day supply from quantity and daily dose using the days supply formula.
This pharmacy technician day supply calculator is a free pharmacy math calculator for training. To calculate prescription day supply, convert the sig into a daily dose, then divide the prescription quantity by that daily use — the days supply formula — and floor a partial last day. Each dosage-form page is a prescription day supply calculator with the matching pharmacy day supply calculation.
Need a specific form? Use the tablet and capsule day supply calculator for QD, BID, and TID, the insulin vial and pen calculator when units are on the label, or the inhaler days-supply tool for labeled actuations. After days supply, open the prescription refill due-date calculator. Every form also lives on the free pharmacy technician tools hub.
| Step | Action |
|---|---|
| 1 | Convert the sig into measurable daily use (tablets/day, mL/day, units/day, puffs/day, or drops/day). |
| 2 | Divide dispensed quantity by that daily use. |
| 3 | Floor a partial last day — do not round up days supply for billing practice. |
Days supply is how many days the dispensed quantity will last if the patient uses the medication exactly as directed. Pharmacy technicians calculate it by dividing total dispensed amount by daily use, then rounding down.
Convert the directions into daily use, divide the dispensed quantity by that daily amount, then floor a partial last day. Example: 30 tablets ÷ 1 tablet twice daily (2 per day) = 15 days.
No. Allied Health Academy's days supply calculator only performs math from the quantity and directions you enter. It does not recommend doses, diagnose, or determine insurance coverage.
Eye drops require converting milliliters to drops, accounting for drops per dose and how many eyes are treated each time. Using bottle mL alone without sig conversion gives incorrect days supply.
Keep the actual days supply from quantity ÷ daily use (for example Lantus 150 days or a 180-day Repatha interval). Ask the pharmacy manager how your software records an insurance days-supply override when a plan will not accept that number. This tool does not set coverage.
Yes. Every public Allied Health Academy pharmacy calculator is free to use with no account required. Optional paid pocket cards and courses are labeled separately.
Yes for training and workflow math practice. Always verify the result against the prescription, the product label, and your pharmacist before billing a claim. Escalate unclear sigs instead of guessing.
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.