Prescription Refill Calculator

Calculate refill dates, days supply and prescription quantities in seconds. Clear step-by-step results for tablets, liquids, inhalers, drops and sprays.

Calculate prescription refill dates, days supply and medication quantities quickly and clearly.

Prescription Refill Calculator helps patients, caregivers, pharmacy students and healthcare professionals perform common medication calculations without relying on mental math.

REFILL DATE CALCULATOR

Enter the original fill date and days supply to calculate:

• Suggested refill date • First and last covered dates • Next coverage date • 28-day, 30-day, 60-day and 90-day schedules • Early refill date adjustments

DAYS SUPPLY CALCULATOR

Calculate how long a dispensed medication should last using:

• Quantity dispensed • Units used per dose • Doses per day • Custom frequencies • Optional rounding rules

QUANTITY CALCULATOR

Estimate the quantity required for a selected treatment period:

• 30-day supply • 60-day supply • 90-day supply • Custom treatment durations • Tablets, capsules and other dosage forms

MULTIPLE DOSAGE FORMS

Use dedicated calculations for:

• Tablets and capsules • Oral liquids • Inhalers • Nasal sprays • Eye drops • Ear drops

CLEAR, EXPLAINED RESULTS

Every result includes a step-by-step breakdown so you can understand how the calculation was produced. Save useful calculations and quickly access them again from your private history.

PRIVACY FIRST

Medication names are optional. Your saved calculations remain on your device, and no account is required.

REFILL PRO

Unlock additional tools with one lifetime purchase:

• Remove advertising • Reverse quantity calculations • 30-day, 60-day and 90-day presets • Inhaler and nasal spray calculators • Eye and ear drop calculators • Unlimited calculation history • Saved favorites and templates • Shareable PDF summaries

IMPORTANT DISCLAIMER

This app is an informational calculation tool only. It does not provide medical advice, diagnose conditions, determine prescription eligibility or authorize an early refill. Results depend entirely on the information entered by the user.

Prescription rules, insurance coverage and pharmacy policies can vary. Always follow the prescription label and consult your pharmacist, prescriber or another qualified healthcare professional before making decisions about medication use or refill timing.