Days Supply Calculator
How long a prescription lasts.
Work It Out And Get Clear Answers
How long a prescription lasts.
Days Supply Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Press Calculate to see the result.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Days Supply Quick Guide
Typical values for reference.
| Quantity dispensed | Doses per day | Units per dose | Days supply |
|---|---|---|---|
| 90 | 2 | 1 | 45 days |
| 45 | 2 | 1 | 22.5 days |
| 180 | 2 | 1 | 90 days |
| 90 | 1 | 1 | 90 days |
| 90 | 4 | 1 | 22.5 days |
| Rule of thumb: check your inputs, use the result as a guide and round sensibly. | |||
Days Supply FAQ
Answers to common questions about this calculator.
Days = quantity Ă· (doses per day Ă— units per dose).
It uses the default inputs shown and the formula described above. Change any value and press Calculate to see how the result moves.
It is an estimate based on the inputs you enter. Check real quotes, labels, product data or official guidance for important decisions.
Yes. Replace each input with your own figures and press Calculate to update the result.