Prescription Refill Date Calculator
See the first day your pharmacy can refill a prescription, how many days of medicine you have left, and put the date in your calendar. Free and private: what you type stays on your device.
Earliest refill date
Working it out…
When can you refill? Common supplies at a glance
Most insurance plans approve a refill once a set share of the last supply has passed. Find your supply and your plan’s limit to see how many days after pickup the refill window opens.
| Supply | 70% limit | 75% limit | 80% limit | 85% limit | 90% limit |
|---|---|---|---|---|---|
| 28 days | 20 days | 21 days | 23 days | 24 days | 26 days |
| 30 days | 21 days | 23 days | 24 days | 26 days | 27 days |
| 60 days | 42 days | 45 days | 48 days | 51 days | 54 days |
| 90 days | 63 days | 68 days | 72 days | 77 days | 81 days |
Example: you pick up a 30-day supply on March 1 and your plan’s limit is 75%. The refill should go through from March 24, 23 days later.
How the refill date is worked out
- 1Multiply the days supply by your plan's limit.30 days × 75% = 22.5 days.
- 2Round up to a whole day.Pharmacy systems wait until the full share has passed, so 22.5 becomes 23.
- 3Count that many days from your pickup date.Picked up October 2 + 23 days = October 25, the first day the refill should go through.
Why the pharmacy might give a different date
- Your plan uses another limit. Anything from 70% to 90% is common, and some plans set limits per drug.
- You’ve refilled early before. Some plans add up the extra days from several early refills and block the next one once you’ve built up too much.
- The days supply on file differs. A dose change, or an estimate for drops, inhalers or insulin, changes the math.
- It’s a controlled substance. Schedule II drugs such as Adderall or oxycodone can’t have refills under federal law; each fill needs a new prescription, and states and pharmacies often add stricter timing.
- State rules and the pharmacist. The pharmacist has the final say on whether a fill is appropriate.
More calculators
Guides
Common questions
How early can I refill a 30-day prescription?
With a 75% limit, 23 days after you picked it up, about a week before it runs out. At 80% it’s 24 days, at 85% 26 days and at 90% 27 days. Your plan’s limit decides which one applies.
How early can I refill a 90-day prescription?
At 75%, 68 days after pickup, roughly three weeks before you run out; at 80%, 72 days. Mail-order pharmacies usually accept the order as soon as the window opens, so order on that day to allow for shipping.
Does the day I picked it up count?
Insurance systems count the days that have passed since the fill date, so pickup day is day 0. That’s why a 30-day supply at 75% opens 23 days later, not 22.
Can I refill early for a trip?
Often, yes. Many plans have a vacation or travel override that lets the pharmacy fill early once or a few times a year. Ask your pharmacist to request it, or call the member number on your insurance card. Controlled substances are usually excluded. More on early-refill exceptions
What if I'm about to run out and the refill isn't allowed yet?
Call your pharmacy first. They can ask your plan for an override or contact your prescriber, and many states let pharmacists hand out a short emergency supply of many everyday medicines. What to do if you’re running out
Is what I type saved or shared?
Your entries are saved only in your own browser so the calculator remembers them. They never reach us. Analytics, where used, counts visits and which tools are used, never what you type. Privacy policy
Who makes this
I’m Imtinan Farooq, a data engineer who builds health software. I’m not a pharmacist, so every number on this site comes from the published rule it’s based on, and the math is shown so you can check it. If something looks wrong, please tell me.