Determining your next refill date just got easier with our free online prescription refill calculator. This calculator allows you to easily determine when next you should be going for your refill. It is quite easy to use and also very accurate. Try it out below!
Prescription Refill Calculator
How to Use Our Refill Calculator
- Enter the initial Date you filled your prescription (Fill date) by either typing this date in the input field or by clicking the date picker icon to open the calendar from where you can now choose the desired date.
- Specify the number of days your supplied medications are intended to last you. This is referred to as the day supply. Then proceed to select the appropriate unit either in days, weeks, months, or years.
- Click on the Calculate next refill date button to obtain the calculated next date you should be going for your meds refill.
About Our Prescription Refill Calculator
Flashcalculator’s prescription refill calculator is programmed to assist you in accurately determining the date to go for your next meditation refill. Knowing the right date to go for your meds refill helps prevent you from running out of medications which could have dire consequences on your treatment.
Our tool was designed and reviewed by a licensed pharmacist and has been tested and proven to be highly accurate. The user interface is very friendly and was designed to be easy to use by people of all age groups. The input fields are clearly labelled and the steps to take are correctly outlined above.
Don’t miss your next refill date, determine it now by partaking in the magic of our refill calculator.
How to calculate your refill date?
Calculating your refill date is very simple. It can be done either manually or with the use of a refill calculator like ours. To calculate your prescription refill date manually, simply write down the date you filled the prescription (i.e the fill date – the date your meds were dispensed). Then add the total number of days your dispensed medications are intended to last (days supply).
The date you arrive at after adding your days supply to your fill date is your refill date. This is the date your dispensed medication will finish, assuming you didn’t skip any doses and you also took them as advised.
Below are the summarised steps involved in calculating a prescription refill date.
- First Step: Identify the date when you originally obtained your prescription medication.
- Second Step: Determine the total number of days your current supply is intended to last. You can calculate this by multiplying the daily dosage (number of units or pills taken each day) by the number of days prescribed by your doctor. Our convenient days supply calculator can assist you with this calculation.
- Third Step: To find the date when you’ll need a refill, simply add the total number of days your supply is meant to last to the original fill date. This will give you the date when your current prescription will be exhausted. This is also the date you should plan to obtain a refill to ensure an uninterrupted course of treatment.
Example Calculation
Assuming you have a prescription for a 30-day supply of tablets, and you filled the prescription on June 1st. To calculate the next refill date, follow these steps.
Calculate the Days Supply using the formula below or our online calculator:
Days of supply = Tablets taken per day × Days intended to last
Assuming you take 3 tablets a day:
Days supply = 3 tablets a day × 30 days intended to last
= 90 days of supply
Proceed to calculate the refill date using the formula below:
Refill date = Date filled + Total days of supply
= June 1st + 90days
= August 30
Based on this example, the next prescription refill date would be August 30.
How to Calculate a 28-day Prescription Refill?
To calculate when you need to refill a 28-day prescription:
- Note the date you take the first dose from the new 28-day supply.
- Count forward 27 days from that first dose date on a calendar. The 27th day marks when you’ll take the final dose before needing a refill.
- Add one day to that final dose date – this is day 1 of your next 28-day refill period when you can get a new supply.
- Each 28-day prescription provides 28 doses. The day after your last scheduled dose starts the next 28-day window for refilling.
The key is tracking the 27-day cycle after starting a new 28-day supply to know when you’ll need to refill for an uninterrupted course of medication.
How to Calculate a 30-day Prescription Refill?
To calculate when you need to refill a 30-day prescription:
- Record the date you take the first dose from your new 30-day supply.
- Count forward 29 days on the calendar from that first dose date. Circle or highlight this 29th day – it’s when you’ll take the last dose before needing a refill.
- To get the start of your next 30-day refill period, add one day to that final dose date. For example, if your last dose was July 5th, July 6th begins the next 30-day cycle.
- Each 30-day prescription provides 30 doses. The day after your final scheduled dose is day 1 for refilling the next 30-day supply.
The key dates to track are the first dose from a new 30-day supply, the 29th day for the final dose, and the next day which starts the refill countdown. Staying on this 30-day cycle ensures an uninterrupted medication course.
How to Calculate a 90-day Prescription Refill?
To calculate when you need to refill a 90-day prescription:
- Record the date you take the first dose from your new 90-day supply.
- Count forward 89 days on the calendar from that first dose date. Circle this 89th day – it’s when you’ll take the last dose before needing a refill.
- To get the start date for your next 90-day refill period, add one day to that final 89th dose date. For example, if your last scheduled dose was September 12th, September 13th begins the next 90-day cycle.
- Each 90-day prescription provides 90 doses. The day after your final scheduled dose is day 1 for refilling the next 90-day supply.
The key dates are the first dose from a new 90-day supply, the 89th day for the final dose, and the following day which starts the refill countdown. Adhering to this 90-day cycle ensures continuous medication access.