Prescription Refill Calculator

Use this calculator to estimate how long your current prescription supply will last, and to understand the total duration and quantity of your medication, including all remaining refills. This can help you plan your refills and manage your medication schedule effectively.

Pills Per Dose:

The number of pills or units you take at one time (e.g., 1 tablet, 0.5 capsule).

Doses Per Day:

How many times per day you take the medication (e.g., 1 for once daily, 2 for twice daily).

Total Pills Dispensed (Current Supply):

The total number of pills or units in your current bottle or supply.

Days Supply Per Refill (Prescribed):

The number of days your doctor *intended* each refill quantity to last (often printed on the prescription label, e.g., "30 Day Supply").

Refills Remaining:

The number of refills you have left on your prescription (excluding the current fill).

function calculateRefill() { var pillsPerDose = parseFloat(document.getElementById('pillsPerDose').value); var dosesPerDay = parseFloat(document.getElementById('dosesPerDay').value); var totalPillsDispensed = parseFloat(document.getElementById('totalPillsDispensed').value); var daysSupplyPerRefill = parseFloat(document.getElementById('daysSupplyPerRefill').value); var refillsRemaining = parseFloat(document.getElementById('refillsRemaining').value); var resultsDiv = document.getElementById('refillResults'); resultsDiv.innerHTML = "; // Clear previous results // Input validation if (isNaN(pillsPerDose) || pillsPerDose <= 0 || isNaN(dosesPerDay) || dosesPerDay <= 0 || isNaN(totalPillsDispensed) || totalPillsDispensed <= 0 || isNaN(daysSupplyPerRefill) || daysSupplyPerRefill <= 0 || isNaN(refillsRemaining) || refillsRemaining < 0) { resultsDiv.innerHTML = 'Please enter valid positive numbers for all fields. Refills Remaining can be zero.'; return; } // Calculations var dailyPillConsumption = pillsPerDose * dosesPerDay; var estimatedDaysCurrentSupply = totalPillsDispensed / dailyPillConsumption; // Total fills include the current one + remaining refills var totalFills = refillsRemaining + 1; var totalDaysPrescriptionDuration = daysSupplyPerRefill * totalFills; var totalPillsForPrescription = totalPillsDispensed * totalFills; // Display results var resultsHTML = '

Your Refill Schedule & Medication Overview:

'; resultsHTML += 'Estimated Days Current Supply Will Last: ' + estimatedDaysCurrentSupply.toFixed(1) + ' days'; resultsHTML += 'Based on your current usage, your current bottle of ' + totalPillsDispensed + ' pills will last approximately ' + estimatedDaysCurrentSupply.toFixed(1) + ' days.'; resultsHTML += 'Total Prescription Duration (Including Current Fill): ' + totalDaysPrescriptionDuration.toFixed(0) + ' days'; resultsHTML += 'Your entire prescription, including the current fill and ' + refillsRemaining + ' remaining refills, is intended to last for a total of ' + totalDaysPrescriptionDuration.toFixed(0) + ' days.'; resultsHTML += 'Total Pills for Entire Prescription (Including Current Fill): ' + totalPillsForPrescription.toFixed(0) + ' pills'; resultsHTML += 'Over the full course of this prescription (current fill + ' + refillsRemaining + ' refills), you will receive a total of ' + totalPillsForPrescription.toFixed(0) + ' pills.'; if (estimatedDaysCurrentSupply.toFixed(1) !== daysSupplyPerRefill.toFixed(1)) { resultsHTML += 'Note: Your estimated days supply for the current bottle (' + estimatedDaysCurrentSupply.toFixed(1) + ' days) differs from the prescribed days supply per refill (' + daysSupplyPerRefill.toFixed(0) + ' days). This could be due to taking a different dose than prescribed, or a different quantity being dispensed.'; } resultsDiv.innerHTML = resultsHTML; } .prescription-refill-calculator { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f9f9f9; border: 1px solid #ddd; border-radius: 8px; padding: 25px; max-width: 700px; margin: 30px auto; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); } .prescription-refill-calculator h2 { color: #2c3e50; text-align: center; margin-bottom: 25px; font-size: 1.8em; } .prescription-refill-calculator p { color: #555; line-height: 1.6; margin-bottom: 15px; } .calculator-inputs label { display: block; margin-bottom: 8px; font-weight: bold; color: #34495e; font-size: 1.05em; } .calculator-inputs input[type="number"] { width: calc(100% – 22px); padding: 12px; margin-bottom: 10px; border: 1px solid #ccc; border-radius: 5px; font-size: 1em; box-sizing: border-box; } .calculator-inputs .input-description { font-size: 0.85em; color: #777; margin-top: -5px; margin-bottom: 15px; } .calculator-inputs button { display: block; width: 100%; padding: 14px; background-color: #28a745; color: white; border: none; border-radius: 5px; font-size: 1.1em; font-weight: bold; cursor: pointer; transition: background-color 0.3s ease; margin-top: 20px; } .calculator-inputs button:hover { background-color: #218838; } .calculator-results { background-color: #e9f7ef; border: 1px solid #d4edda; border-radius: 8px; padding: 20px; margin-top: 30px; color: #155724; } .calculator-results h3 { color: #218838; margin-top: 0; margin-bottom: 15px; font-size: 1.5em; text-align: center; } .calculator-results p { margin-bottom: 10px; font-size: 1.05em; } .calculator-results p strong { color: #0f5132; } .calculator-results .error { color: #dc3545; font-weight: bold; text-align: center; } .calculator-results .warning { color: #ffc107; background-color: #fff3cd; border-left: 5px solid #ffc107; padding: 10px; margin-top: 15px; border-radius: 4px; }

Understanding Your Prescription Refill Schedule

Managing your medications effectively is crucial for your health. Knowing when your current supply will run out and how many refills you have left can prevent gaps in your treatment and help you plan pharmacy visits. Our Prescription Refill Calculator is designed to give you a clear overview of your medication schedule.

What is a Prescription Refill Calculator?

A Prescription Refill Calculator is a simple tool that helps you determine how long your current medication supply will last and the total duration of your prescription, including all available refills. By inputting key details from your prescription label and your daily usage, you can get an accurate estimate of your medication timeline.

Why is This Calculator Useful?

Avoid Running Out: Get an estimate of when you'll need to request a refill, preventing last-minute rushes or missed doses.
Plan Ahead: Coordinate pharmacy visits, especially if you have multiple medications or need to contact your doctor for a new prescription.
Understand Your Treatment Duration: See the total number of days your medication is prescribed for and the total quantity of pills you'll receive.
Identify Discrepancies: If your actual usage differs from the prescribed "days supply," the calculator can highlight this, prompting you to discuss it with your pharmacist or doctor.

How to Use the Prescription Refill Calculator

To get the most accurate results, gather the following information from your prescription bottle or your doctor's instructions:

Pills Per Dose: This is the number of pills, capsules, or units you take each time you medicate. For example, if you take "one tablet," enter 1. If you take "half a tablet," enter 0.5.
Doses Per Day: How many times a day you take your medication. For instance, "once daily" is 1, "twice daily" is 2, and "three times a day" is 3.
Total Pills Dispensed (Current Supply): Look at your current medication bottle. This is the total number of pills or units that were given to you in that specific fill (e.g., "Quantity: 30 tablets").
Days Supply Per Refill (Prescribed): This is often printed on your prescription label and indicates how many days your doctor *intended* that quantity of medication to last (e.g., "30 Day Supply," "90 Day Supply"). This is crucial for understanding the overall prescription duration.
Refills Remaining: Also found on your prescription label, this number tells you how many times you can get the prescription refilled before needing a new one from your doctor.

Example Scenario:

Let's say you have a prescription with the following details:

Pills Per Dose: 1 tablet
Doses Per Day: 2 times a day
Total Pills Dispensed (Current Supply): 60 tablets
Days Supply Per Refill (Prescribed): 30 days
Refills Remaining: 2

Using the calculator:

Daily Pill Consumption: 1 pill/dose * 2 doses/day = 2 pills per day
Estimated Days Current Supply Will Last: 60 pills / 2 pills/day = 30 days
Total Prescription Duration: (2 refills + 1 current fill) * 30 days/refill = 3 * 30 = 90 days
Total Pills for Entire Prescription: (2 refills + 1 current fill) * 60 pills/fill = 3 * 60 = 180 pills

This means your current bottle will last 30 days, and the entire prescription (including all refills) will cover 90 days, providing you with a total of 180 pills.

Important Considerations:

This calculator provides estimates based on the information you provide. Always consult with your pharmacist or doctor for precise refill dates, dosage instructions, and any concerns about your medication. Do not adjust your medication schedule without professional medical advice.