Free Tool
Supply Duration Calculator
Estimate whole uses and days of supply from a product label and an existing clinician-directed schedule.
Enter label and schedule values to estimate supply.
How the estimate works
Whole uses equal the total labeled amount divided by the amount per use, rounded down. The tool then divides those whole uses by the entered uses per week. It does not count an incomplete final amount as another use.
The estimate assumes the entered schedule continues unchanged. It does not evaluate storage, beyond-use dates, sterility, or whether a product remains appropriate to use.
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Frequently asked questions
How are whole uses calculated?
The total labeled amount is divided by the amount per use and rounded down. An incomplete final amount is shown as a remainder, not counted as another use.
Can I enter milligrams or micrograms?
Yes. The total container amount is entered in milligrams. The amount per use can be entered in milligrams or micrograms; the tool converts micrograms to milligrams for the calculation.
Why can actual supply be lower?
Handling loss, dead space, product instructions, expiration, and schedule changes can reduce usable supply. The result is arithmetic, not a guarantee.
Does this tool tell me how much or how often to use?
No. Enter only values already provided on the product label and by your qualified clinician or pharmacist.
Does this check storage or beyond-use dates?
No. It does not evaluate storage, sterility, expiration, or beyond-use dates. Follow the product and pharmacy instructions.