Inhaler days calculator
An inhaler can run out with no warning if it has no counter. Enter the puffs on the label and how you use it to see how long it lasts.
The figures above are an example until you change them. Nothing you type leaves your browser.
What the number tells you
Divide the puffs in the inhaler by the puffs you use each day. Reorder well before the last day, so you are not caught without it.
What it leaves out
For a reliever used only when needed, there is no fixed answer. Use your usual week as a guide. If you are using it more than usual, talk to your doctor.
Priming puffs and the expiry date also count. Check the leaflet, and use the dose counter if your inhaler has one.
Common questions
How long does a 200 puff inhaler last?
At 2 puffs twice a day, 50 days. At 2 puffs once a day, 100 days.
How long does a 120 puff inhaler last?
At 2 puffs twice a day, 30 days.
How do I know when my inhaler is empty?
Use the dose counter if it has one. If it doesn't, keep count of your puffs. Ask your pharmacist how to check yours.
Does priming use up puffs?
Yes, priming sprays count. The leaflet tells you when to prime your inhaler.
Know before it runs out
Cadence counts your puffs down as you log each dose and reminds you before it runs low. Free, with no account and no subscription.
More free tools: Days supply calculator, Prescription refill calculator, Refill reminder calendar, All free tools