Medication Run-Out Date Calculator
Turn label-confirmed quantity into a run-out checkpoint or place a prescribed course duration on the calendar without changing directions. Sensitive inputs stay in your browser.
Enter the dispensed quantity and directions exactly as written before using a run-out estimate.
Context matters.
- Do not change, split, skip, stop or extend a medicine based on this calculator.
Sources & scope
The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.
A visible path from input to answer.
Turn label-confirmed quantity into a run-out checkpoint or place a prescribed course duration on the calendar without changing directions. The page keeps the calculation scope and its limits beside the result so the output can be checked, copied or revisited.
- Read the record. The calculator uses What do you want to track?, First dose date, First dose time, Quantity dispensed and Units per dose and 5 additional fields supplied in the form.
- Apply the scope. It applies the Label-derived quantity arithmetic — no dose change, refill eligibility or clinical instruction reference and the explicit date, unit and counting conventions shown in the result.
- Expose the checkpoints. Intermediate rows, warnings and timeline events stay visible; the emphasized row identifies the primary checkpoint when one exists.
Enter the dispensed quantity and directions exactly as written before using a run-out estimate.
- Label checkNot confirmed
Calculation purpose: Turn label-confirmed quantity into a run-out checkpoint or place a prescribed course duration on the calendar without changing directions. This is a high-sensitivity reference output; the linked authority or qualified professional controls the final decision.
Calendar inputs use plain year-month-day semantics. Leap days, month ends, date-pair order and unsupported dates are checked before the result is shown.
Rule set 1.1.0 · Last reviewed 2026-08-23 · Next review due 2027-02-23. The source panel below contains the linked evidence.
What to know before using the result.
How is medication day supply calculated?
CalcSpan divides the dispensed quantity by units per dose and dose frequency, then shows the last complete scheduled dose and the next dose without supply.
Is the run-out date my refill eligibility date?
No. Insurance, pharmacy, prescriber, controlled-substance and early-fill rules are excluded.
Can I use this for as-needed directions?
Only if you enter a hypothetical fixed frequency and treat the result as arithmetic. Variable or as-needed use cannot produce a reliable calendar run-out date.