Calculate your medication refill dates and supply duration
Next Refill Date
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Days Until Refill
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Expected Supply Duration
- days
Daily Consumption
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Total Medication Needed
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Daily Consumption
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This calculator relieves you from the mundane task of computing days supply and the amount of medicine needed for a given therapy. It will also help you calculate your next refill date.
Dig into our prescription refill calculator and make your medication management easier!
This tool cannot replace a real medical consultation. Always double-check the calculations, dosing information, and contraindications on the leaflet. Consult your health provider before administering any medication.
This calculator allows you to perform three different kinds of refill calculations:
Enter your fill date and days supply to calculate when you'll need a refill.
Enter your medication details to calculate how long your current supply will last.
Enter your dosage details and expected supply duration to calculate how much medication you'll need.
You have a 100mL bottle of medication:
You have 90 tablets:
Write down the date of your first dose. Add 29 days to get the last dose date. The next refill should begin the day after (+30 days). Remember that months have different numbers of days.
Remember your first dose date. Add 89 days to get the last dose date. The next refill should begin the day after (+90 days). Account for varying month lengths.
28 days equals 4 weeks. Find your first dose date, add 27 days for the last dose. Next refill starts a day after (+28 days). Use a calendar for accuracy.
Rx (prescription) drugs require a doctor's prescription and are typically stronger. OTC (over-the-counter) drugs are more accessible but should still be used carefully. Both may require refill calculations.
We try our best to make our calculator as precise and reliable as possible. However, this tool can never replace professional medical advice, diagnosis, or treatment. All information here is for informational purposes only and should not serve as a substitute for medical consultation. Always seek the advice of a health provider.