Calculate when you'll need your next prescription refill
Managing prescription medications effectively is crucial for maintaining your health and well-being. The Prescription Refill Calculator is a simple yet powerful tool designed to help patients, caregivers, and healthcare providers determine when a medication refill will be needed based on the date the prescription was filled and the number of days’ supply provided.
By entering just two values — your fill date and days supply — the calculator will instantly compute your next refill date. This helps you stay on track with your medication regimen, avoid running out of essential prescriptions, and manage your pharmacy visits or mail-order timing more efficiently.
Minimalist design with just the required inputs: Fill Date and Days Supply.
Works seamlessly across mobile, tablet, and desktop devices.
Calculates the exact calendar date when your current prescription supply runs out.
Automatically accounts for variable month lengths (e.g., February) and leap years.
Clear your inputs instantly with the Reset button to start a new calculation.
Pre-fills common supply value (e.g., 30 days) to speed up usage.
Accepts inputs in DD/MM/YYYY format for intuitive entry.
Select or type the date on which you received or started using your prescription medication.
Input the total number of days the medication is supposed to last (e.g., 30 for a 1-month supply).
The tool will display the refill date — the day after your current supply ends.
Click “Reset” to clear all fields and start a new calculation.
| Fill Date | Days Supply | Refill Date |
|---|---|---|
| 01/01/2025 | 30 days | 31/01/2025 |
| 15/03/2025 | 90 days | 13/06/2025 |
| 28/02/2025 | 60 days | 29/04/2025 |
| 20/11/2025 | 15 days | 05/12/2025 |
Patients are less likely to skip doses or experience treatment interruptions.
Helps plan pharmacy visits, online refills, or automatic delivery well in advance.
Some insurance plans allow refills only after a certain number of days; knowing your refill date prevents premature requests.
Can be used repeatedly for different prescriptions with different durations.
Works in any web browser — no downloads, no sign-ups.
| Days Supply | Typical Use |
|---|---|
| 7 days | Short-term antibiotics |
| 14 days | Acute treatments |
| 30 days | Monthly maintenance meds |
| 60 days | Extended supplies |
| 90 days | Long-term management (mail order) |
It calculates the next refill date based on the date you filled your prescription and the number of days' supply you received.
Enter your fill date (DD/MM/YYYY format) and days supply (e.g., 30), then click Calculate to get your refill date.
Yes. Just click the Reset button to clear the form and enter new values.
Yes. The fill date counts as day 1 of your supply.
It’s for patients, caregivers, pharmacists, home health workers, or anyone managing prescriptions.
Yes, it’s designed to work smoothly on phones, tablets, and desktops.
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