Pharmacist Tool
Eye Drops Days Supply Calculator
Calculate eye-drop days supply using bottle size, estimated drops per mL, drops per dose, frequency, and whether the prescription is for one eye or both eyes.
Calculator inputs
Loading FDA eye-drop data…
Default workflow value is 20 drops per mL.
Results
Total drops
—
Drops used per day
4
Estimated days supply
—
Rounded down whole days
—
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 = drops per dose × times per day × eyes treated
Notes for pharmacy workflow
Bottle size may be auto-detected from FDA package description.
Drops per mL is an estimate and may vary by bottle design.
Eye-drop days supply can differ if used in one eye versus both eyes.
Always follow your pharmacy workflow and payer requirements.