CountPillDays supply calculator: how long will my pills last?
Enter how many pills are left and how you take them. It works out how many days that is and the date you will run out, so you can order the refill in time.
Calculate days supply
45 days of supply
Runs out on —
Don't know how many are left? Count them from a photo, free.
How days supply is worked out
Days supply is the number of pills divided by the number taken each day:
days supply = pills ÷ (pills per dose × doses per day)
- 90 tablets, 1 tablet twice a day: 90 ÷ (1 × 2) = 45 days.
- 30 tablets, half a tablet once a day: 30 ÷ (0.5 × 1) = 60 days.
- 56 capsules, 2 capsules twice a day: 56 ÷ (2 × 2) = 14 days.
The calculator rounds down to whole days, because a part-day of pills isn't a full day of doses.
When to order a refill
Many insurance plans allow a refill once roughly three quarters of the supply has been used, which for a 30-day fill is about a week before you run out. Rules differ by plan and by drug, and controlled substances often have stricter limits, so check with your pharmacy. Ordering a week ahead leaves time for a delayed delivery or a prescription that needs renewing.
Get the count right first
The answer is only as good as the count you start with. Counting a bottle of 90 by hand is slow and easy to lose track of. The free pill counter counts them from one photo, in your browser, without uploading anything. For carers checking a supply regularly, see counting pills at home.
This calculator is for planning only. Always follow the directions on your prescription and ask your pharmacist if you're unsure about a dose.
Questions
How do you calculate days supply?
Divide the number of pills by the number taken per day. 90 tablets at 1 tablet twice a day is 90 ÷ 2 = 45 days.
What if the dose is half a tablet?
Enter 0.5 as the pills per dose. 30 tablets at half a tablet once a day lasts 60 days.
When should I order a refill?
Many pharmacies and insurers allow a refill when about a week of supply is left. Check your plan's rule, and order early before holidays and travel.
The CountPill iPhone app · coming soon
Counting pills every day? The app keeps the record.
- Live count from the camera, with a level so you shoot straight down.
- Rx quantity check: "Need 4 more", "Matches" or "2 too many", as you count.
- Stock-bottle barcode and Rx label reading to catch the wrong bottle.
- Double counts for controlled drugs, with both counts kept.
- History, search, and PDF and CSV reports with photos, lot, expiry and initials.
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