Free calculator
How long will a bottle of liquid medicine last?
Enter what's left in the bottle in millilitres, the dose in ml and how many times a day. You get the number of days it lasts and when to get a new bottle – or switch to how many ml you need for a set number of days.
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Your supply lasts
10days
- Order the refill bySunday, 1 November 2026
- Last day coveredSaturday, 7 November 2026
- In months, roughly0.3
- You use per day15
- Needed for 30 days / 90 days450 / 1,350
Many liquid medicines must be used within a set time after opening, even if some is left. That date is on the label or in the leaflet.
This calculator does arithmetic on the numbers you enter. It doesn't replace the instructions on your prescription label or the advice of your pharmacist or doctor.
Doserra keeps this count for you: every dose you confirm comes off the stock, and you're reminded to refill before you run out. Try it free
Guides on this topic
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ReadHow to calculate days from millilitres
Days = ml in the bottle ÷ (ml per dose × doses per day). A 150 ml bottle at 5 ml three times a day uses 15 ml a day, so it lasts 10 days. A 100 ml bottle at 10 ml twice a day lasts 5 days.
Labels sometimes use spoons: 1 teaspoon = 5 ml and 1 tablespoon = 15 ml in medicine dosing. Kitchen spoons vary a lot, so measure with the oral syringe or cup that came with the medicine.
Why a bottle runs out early
A little stays in the bottle, the syringe and the cup each time, and spills happen. Order the next bottle a few days before the date shown. Many liquids also have to be used within a certain time after opening, even if there's some left – that date is on the label or in the leaflet, and your pharmacist can tell you.
No more guessing the bottle
Track liquids in ml, too
Set the stock in ml
Doserra counts any unit – tablets, ml or puffs.
Confirm each dose
Each dose you mark as Taken comes off the bottle.
Get the refill reminder
You're warned before the bottle runs out.
Frequently asked questions
How many days will 100 ml last at 5 ml three times a day?
15 ml a day, so 6 full days with 10 ml left over – not enough for a seventh day.
How many ml is a teaspoon of medicine?
5 ml. Use the measuring syringe or cup from the pack rather than a kitchen spoon.
Can I use the bottle until it's empty?
Only within the time after opening stated on the label or leaflet. Ask your pharmacist if it isn't clear.
Guides
Guides for everyday medicine routines
Practical advice on remembering doses, organising medicines and caring for someone else's.
A Weekly Medication Record Review in Five Checks
A weekly review is a short check of your information and tools. It is not a review of whether your treatment is right for you. Use it to find stale r…
ReadFamily Medication Profiles: Keep Each Person Separate
If you help more than one person, a clear boundary between their records is essential for everyday organisation. Profile names, separate lists and a …
ReadMedication Notes: Turn a Busy Week into Clear Questions
A week of scattered notes can be difficult to explain during a short appointment. A simple structure helps you describe what you noticed, when it hap…
ReadNever wonder again whether you took your medicine.
Add a medicine in a minute and Doserra reminds you at every dose, keeps the history and warns you before it runs out. Free for 2 medications, no account.
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