How the Next Refill Date Is Worked Out
If your label already shows the days supply, you don't need to do any dividing. Add the days supply to the fill date:
Next Refill Date = Last Fill Date + Days Supply
A 30-day supply filled on January 20 is due again on February 19. A 90-day supply filled the same day is due April 20 (or April 19 in a leap year, because February has an extra day).
This page repeats that for every fill after the next one, so you can see the next 4, 6 or 12 refill dates at once and put them all on your calendar. Think of it as a next refill date calculator (or medication refill date calculator) plus a yearly planner: the first row is your next refill, and the rest are the ones after it.
If you don't know the days supply yet, start with the pill refill date calculator, which works it out from your pill count and daily dose.
Why Refill Dates Don't Stay on the Same Day of the Month
A fixed days supply against months of different lengths makes the date wander. Here is a 30-day supply filled on January 1, 2027:
| Refill | Due date | Why it moved |
|---|---|---|
| 1 | Jan 31 | January has 31 days |
| 2 | Mar 2 | February 2027 has only 28 days |
| 3 | Apr 1 | March has 31 days |
| 4 | May 1 | April has 30 days |
| 12 | Dec 27 | About 5 days earlier than the start of the year |
If you'd rather pick up on the same weekday every time, ask whether your prescription can be written for 28 days. Four-week cycles always land on the same day of the week.
Where to Find the Fill Date and Days Supply
- On the label: look for "Filled," "Date," or "Rx date" and "DS" or "Days supply." Layouts vary between pharmacies.
- On the receipt or the stapled paperwork: days supply is often listed even when it's missing from the label.
- In your pharmacy's app or website: most show the last fill date and when you're next due.
- Not listed anywhere? Divide the quantity by how many you take a day, or use the pill refill date calculator instead.
Early Refills and Your Schedule
Picking up a refill a few days early is normal, especially before a weekend or a holiday. Two things to keep in mind:
- If you count the next date from the day you actually picked up, your whole schedule moves earlier each time. Counting from when you'd actually run out keeps it steady.
- Some plans keep a running total of days gained through early fills. Refilling a few days early every month can add up until the plan stops paying for early fills. The refill too soon calculator explains how that works.
Adding the Schedule to Your Calendar
Use Download calendar file to save every upcoming date as one .ics file. Open it on your phone or computer and Apple Calendar, Outlook or Google Calendar will add all the events at once, each as an all-day reminder on your chosen reminder day. The file is created in your browser; RefillDay never receives it.
If you only want the next date, Add Refill Date to Google Calendar opens a pre-filled event in a new tab.