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Pure administrative date-math for prescription refill tracking: given the days' supply per fill, the last fill date, and the number of refills remaining, computes the next refill-due date and a countdown of subsequent refill dates until the prescription (including all remaining refills) is exhausted. This is pharmacy logistics scheduling, not a dosing decision — it does not calculate or suggest medication amounts. Always confirm actual refill eligibility with your pharmacy.
How it works
Enter your last fill date, days' supply per fill, and refills remaining. The tool adds the days' supply to the last fill date to get the next refill-due date, then projects the full remaining refill schedule.
- Enter last fill date.
- Enter days' supply per fill.
- Enter refills remaining (after the current fill).
- Click Calculate to see your results.
Examples
Last fill Jan 1, 30-day supply, 3 refills remaining
Next refill due: Jan 31. Full schedule: Jan 31, Mar 2, Apr 1, May 1 (fully exhausted).
Who should use it
- Tracking when to request your next prescription refill.
- Planning around a long-term medication schedule.
Industry applications
- Pharmacy logistics and patient education
- Medication adherence support
Advantages
- Simple, transparent date-math.
- Projects the entire remaining refill schedule, not just the next date.
Limitations
- Does not account for insurance-specific early-refill rules or pharmacy stock availability.
Common mistakes to avoid
- Not accounting for early-refill restrictions some insurance plans apply (often disallowing refills more than a few days before the days'-supply is used up).
Best practices
- Set a reminder a few days before the computed next refill-due date to allow time for pharmacy processing.
Tips
- If you take multiple medications with different days'-supply amounts, run this calculator separately for each to keep track of all your refill dates.