90-Day Supply Calculator



Calculating a 90-day supply of medications is crucial for individuals managing chronic conditions or taking prescription drugs on a long-term basis. To simplify this process, we present a user-friendly 90-Day Supply Calculator implemented in HTML and JavaScript. This calculator allows users to input relevant information and obtain an accurate estimate of their medication supply.

How to Use

To use the 90-Day Supply Calculator, follow these steps:

  1. Input the current quantity of medication you have.
  2. Enter the prescribed dosage per day.
  3. Specify the number of doses per prescription refill.
  4. Click the “Calculate” button to obtain the estimated 90-day supply.


The formula used for the calculation is:

This formula ensures a precise calculation, taking into account the current quantity, dosage per day, and doses per refill.


Suppose you have 60 tablets, need 2 tablets per day, and each prescription provides 30 tablets. The calculation would be:


Q: Can I use the calculator for any type of medication?
A: Yes, the calculator is versatile and can be used for any medication as long as you input the correct values.

Q: Why is it important to calculate a 90-day supply?
A: Calculating a 90-day supply helps individuals plan and manage their medication refills efficiently, ensuring they have an adequate quantity on hand.

Q: What if my prescription dosage changes?
A: Simply input the updated dosage into the calculator, and it will provide a new estimate based on the changed parameters.


In conclusion, the 90-Day Supply Calculator simplifies the process of estimating medication supplies for individuals with long-term prescriptions. By following the straightforward steps and using the accurate formula, users can plan ahead and ensure they always have an ample supply of their necessary medications.

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