Pharmacist Tool
Ear Drops Days Supply Calculator
Calculate otic days supply using bottle size, estimated drops per mL, dosing frequency, one-ear or both-ears directions, and optional duration limits.
Free ear drops days supply calculator for pharmacists and pharmacy technicians. Estimate otic day supply using bottle size, drops per mL, drops per dose, administrations per day, one ear or both ears, and optional duration caps. This ear drop days supply calculator helps pharmacists calculate otic days supply using bottle size, drops per mL, and dosing frequency.
Calculator inputs
Default workflow value is 20 drops per mL.
Enter 0 for an ear that is not being treated. If directions say “for 7 days,” you can cap the calculated supply here.
Results
Total drops
200
Drops used per day
—
Estimated days supply
—
Rounded down whole days
—
Final billed days supply
—
Formula used
Days Supply = Total Drops in Bottle ÷ Drops Used Per Day
Total Drops = bottle count × bottle size (mL) × drops per mL
Drops Used Per Day = (left ear drops + right ear drops) × times per day
Final billed days supply = lesser of rounded-down calculated days supply or optional duration cap
Notes for pharmacy workflow
Common ear drop examples
Need a drug-specific example? These pages show how days supply can be estimated for common otic prescriptions and then linked back to the main calculator.
Ciprodex days supply calculator
Example calculations for Ciprodex ear drop prescriptions.
Ofloxacin ear drops days supply
Step-by-step ofloxacin otic day supply workflow example.
Ciprofloxacin ear drops days supply
Drug-specific guide for ciprofloxacin ear drop day supply.
General ear drop days supply guide
Learn the formula and workflow behind otic day supply calculations.
Learn how ear drops days supply is calculated
See a step-by-step pharmacist guide covering bottle size, drops per mL, one-ear vs both-ears dosing, and duration limits.
View ear drops guideHow ear drops days supply is calculated
Ear drops days supply is generally calculated by estimating the total number of drops in the dispensed bottle and dividing by the number of drops used per day. In pharmacy workflow, the calculation may also be limited by the prescribed duration when directions specify a fixed number of days. Use our ear drop days supply calculator.
Days Supply = Total Drops ÷ Drops Used Per DayPractical otic day supply can vary based on one-ear versus both-ears use, drops per administration, administrations per day, estimated drops per mL, and whether the prescription includes a duration limit such as “for 7 days.”
Why pharmacists use an ear drops days supply calculator
Typical pharmacy workflow
Frequently asked questions
How do you calculate ear drops days supply?
Ear drops days supply is calculated by estimating the total number of drops in the bottle and dividing by the number of drops used each day based on the prescription directions.
Why can ear drops days supply vary?
Ear drops days supply can vary because drops per mL are estimated, bottle design may differ, and one-ear versus both-ears use changes the total daily number of drops used.
Should duration limits affect otic days supply?
Yes. When directions specify a fixed duration such as 7 days, that duration may cap the practical billed days supply depending on workflow and payer requirements.
More pharmacy calculators
Explore the pharmacy calculators hub for insulin, eye drops, ear drops, and other days supply tools.
Important note
Always use professional judgment and follow product labeling, payer requirements, and pharmacy workflow policies when determining billed days supply for otic medications.