Two figures in, a clear answer out. The prescription refill calculator uses days supply, dosage, dosage, fill date, taken…, date of counting remaining supply, total number of tablets and total volume to produce target refill date, expected supply duration and next refill date, applying the standard relationship for this problem in the order the calculation actually needs it.
What Is the Prescription Refill Calculator?
The prescription refill calculator gives you an estimate of target refill date, expected supply duration and next refill date based on days supply, dosage, dosage, fill date, taken..., date of counting remaining supply, total number of tablets and total volume.
It is a quick reference figure rather than a diagnosis, and it is most useful for tracking how a number moves over time rather than for interpreting a single reading.
How the Prescription Refill Estimate Is Worked Out
The calculation follows published reference relationships, so it is a reasonable approximation when the inputs are accurate. It assumes an average adult and does not account for individual variation.
If you are comparing two people, or the same person over a period of weeks, keep the method and the inputs identical. A change in the method can easily look like a change in the person.
What This Calculator Does Not Do
It does not diagnose anything, and it does not replace advice from a clinician. If a figure comes out at an extreme, or if it differs sharply from what you expect, that is a reason to speak to a professional rather than to adjust the inputs.
Nothing you type here is stored or sent anywhere. The whole calculation happens in your browser.
A Worked Example
Working through an example, with days supply set to 10, dosage set to 5, dosage set to 2, the calculator returns next refill date of 110, and expected supply duration of 1, and expected supply duration (days liquid) of 1. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out target refill date?
Enter days supply, dosage, dosage, fill date, taken..., date of counting remaining supply, total number of tablets and total volume. The calculator then works through the relationship and reports target refill date, expected supply duration and next refill date.
What does the prescription refill actually calculate?
It takes days supply, dosage, dosage, fill date, taken..., date of counting remaining supply, total number of tablets and total volume and converts them into target refill date, expected supply duration and next refill date using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter days supply?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.
Do I have to fill in every field?
Only the fields a particular result depends on. If you leave one blank, the results that need it simply show a note instead of a number, and everything else still works.