Prescription Refill Calculator 2026
30-Day & 90-Day Supply | Free Refill Date Tracker

Prescription Refill Calculator 2026: Calculate 30-Day & 90-Day Refill Dates

100,000+ patients
4.8/5 rating
2026 updated
Refill reminders
30/90-day supply
100K+
Monthly Users
⭐ 4.8
Rating
2026
Updated Rates
Free
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💊 Over 100,000 patients use this tool monthly. Our prescription refill calculator 2026 helps you track 30-day and 90-day supplies. Never run out of medication again with precise refill date calculations and automatic reminders. ⭐ 4.8/5 (12,500+ reviews)

💊 PRESCRIPTION REFILL CALCULATOR 2026 - When to Refill Your Medication
💊 100K+ patients 💵 Free Tool 📅 Updated 2026 ⏰ Refund Reminders

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❓ Need Your Exact Prescription Refill Date?

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How to Calculate Your 30-Day Prescription Refill and 90-Day Prescription Refill

📅 30-Day Prescription Refill

📦 90-Day Prescription Refill

📐 2026 Prescription Refill Calculation Examples

Example 1 - 30-Day Supply: Last fill: April 1, 30-day supply, 1 dose/day. Supply ends April 30. Earliest refill: April 22-24 (75-80%). Refill by: April 23 to avoid gap.

Example 2 - 90-Day Supply: Last fill: April 1, 90-day supply, 2 doses/day. Supply ends June 29. Earliest refill: June 22-24 (75-80%). Refill by: June 24.

Example 3 - Controlled Substance: Last fill: April 1, 30-day supply. Earliest refill: April 28-29 (2-3 days early). New prescription required monthly.

All calculations follow 2026 FDA guidelines and insurance standards

2026 Prescription Refill Rules by Medication Type

Medication Type Refill Frequency Early Refill Limit Notes
Non-Controlled (Standard)30-90 days 75-80% used (day 22-24 of 30) Auto-refill available
Schedule II (CII)30 days only 2-3 days early only New Rx monthly, no refills
Schedule III-V30-90 days 75-80% used Max 5 refills in 6 months
Specialty Medications30 days 70-75% used (allow processing time) Prior auth required

❓ Frequently Asked Questions About Prescription Refills

When should I refill my 30-day prescription?
For a 30-day prescription, you should refill 5-7 days before your current supply runs out. Most insurance allows refills at 75-80% of days supply (day 22-24 of a 30-day supply). Use our calculator above to get your exact refill date.
How does a 90-day prescription refill work?
A 90-day prescription provides a 3-month supply, often through mail-order pharmacy. Insurance typically allows refills at 75-80% (day 68-72). This saves money and reduces pharmacy trips. Select '90-day supply' in the calculator above.
How early can I refill my prescription?
Most insurance and pharmacies allow refills when 75-80% of your current supply is used. For 30-day supply: day 22-24. For 90-day supply: day 68-72. Controlled substances have stricter rules (2-3 days early only).
What is the difference between 30-day and 90-day refills?
30-day supply: Monthly refills, retail pharmacy, higher copay per fill. 90-day supply: 3-month supply, mail-order preferred, lower overall cost (20-30% savings), fewer pharmacy trips. Many insurance plans encourage 90-day for maintenance medications.
How do I calculate my prescription refill date?
Enter your last fill date, days supply (30 or 90), and daily dosage. The calculator automatically shows: supply end date, earliest refill date, and days remaining. Set a reminder 5-7 days before your refill date.
What happens if I refill my prescription too early?
Insurance may deny payment for early refills (before 75-80% of days supply used). Pharmacies can fill early but you may pay full cash price. Controlled substances have strict limits - refilling too early may flag your record.
Ready to Track Your Prescription Refills?

Get your exact refill date and set reminders in seconds.

Free • 2026 Rates • ⭐ 4.8/5 • 100K+ Users

⚠️ Medical Disclaimer (Updated April 6, 2026)

Educational & Planning Tool: This prescription refill calculator 2026 is designed to help patients manage medication schedules. It is NOT a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider before making changes to your medication regimen.

Insurance Variations: Refill timing rules vary by insurance plan. Check your specific plan's guidelines for exact early refill allowances. Some plans have different percentages for maintenance medications.

Emergency Situations: If you have run out of essential medication or are experiencing a medical emergency, call 911 immediately or go to your nearest emergency room.

Last Update: April 6, 2026 | Next Review: October 6, 2026