--- title: "Days Supply Calculator: Free Pharmacy Refill Tool" description: "Free days supply and prescription refill calculator. Get day supply for tablets, liquids, insulin, inhalers, eye drops, and creams, plus worked drug examples." lang: en json-ld: | [ { "@context": "https://schema.org", "@graph": [ { "@type": "WebApplication", "name": "Pharmacy Days Supply Calculator", "url": "https://www.alabamapharmtech.com/tools/days-supply-calculator", "description": "Free days supply calculator for pharmacy technicians. Calculate days supply for tablets, liquids, inhalers, insulin, eye drops, and creams.", "applicationCategory": "HealthApplication", "operatingSystem": "Any", "offers": { "@type": "Offer", "price": "0", "priceCurrency": "USD" }, "publisher": { "@type": "Organization", "name": "Alabama Pharm Tech", "url": "https://www.alabamapharmtech.com" } }, { "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.alabamapharmtech.com/" }, { "@type": "ListItem", "position": 2, "name": "Days Supply Calculator", "item": "https://www.alabamapharmtech.com/tools/days-supply-calculator" } ] }, { "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How do you calculate days supply for tablets?", "acceptedAnswer": { "@type": "Answer", "text": "Divide the quantity dispensed by the number of tablets taken per day (tablets per dose × doses per day). For example, 90 tablets taken 1 tablet twice daily = 90 ÷ 2 = 45 days supply." } }, { "@type": "Question", "name": "How do you calculate days supply for insulin?", "acceptedAnswer": { "@type": "Answer", "text": "Multiply the number of packages by the units per package to get total units, then divide by the total units used per day. A standard 10 mL vial contains 1,000 units (100 units/mL × 10 mL)." } }, { "@type": "Question", "name": "How do you calculate days supply for eye drops?", "acceptedAnswer": { "@type": "Answer", "text": "Convert mL to drops (1 mL ≈ 20 drops), then divide total drops by drops used per day. Multiply the doses per day by drops per dose and by the number of eyes being treated." } }, { "@type": "Question", "name": "How do you calculate days supply for inhalers?", "acceptedAnswer": { "@type": "Answer", "text": "Multiply total puffs (puffs per inhaler × number of inhalers) by the number of inhalers, then divide by puffs per day (puffs per dose × doses per day)." } } ] }, { "@type": "HowTo", "name": "How to calculate days supply for a prescription", "description": "Step by step method pharmacy technicians use to calculate days supply for tablets, liquids, inhalers, insulin, eye drops, and topicals.", "url": "https://www.alabamapharmtech.com/tools/days-supply-calculator", "totalTime": "PT2M", "step": [ { "@type": "HowToStep", "position": 1, "name": "Choose the medication type", "text": "Pick the dosage form on the prescription, such as tablet, liquid, inhaler, insulin, eye drop, or topical, so the right formula is used.", "url": "https://www.alabamapharmtech.com/tools/days-supply-calculator#step-1" }, { "@type": "HowToStep", "position": 2, "name": "Enter the quantity dispensed", "text": "Use the package quantity you are actually billing, such as 30 tablets, 10 mL, or a 30 gram tube.", "url": "https://www.alabamapharmtech.com/tools/days-supply-calculator#step-2" }, { "@type": "HowToStep", "position": 3, "name": "Enter the amount used per day", "text": "Read the sig and convert it into one number per day, such as 2 tablets a day, 4 drops a day, or 2 grams a day.", "url": "https://www.alabamapharmtech.com/tools/days-supply-calculator#step-3" }, { "@type": "HowToStep", "position": 4, "name": "Divide and round down", "text": "Divide the quantity dispensed by the amount used per day and round down to a whole number of days.", "url": "https://www.alabamapharmtech.com/tools/days-supply-calculator#step-4" }, { "@type": "HowToStep", "position": 5, "name": "Check the result against plan rules", "text": "Confirm the days supply fits the plan limits and matches the package size before you submit the claim.", "url": "https://www.alabamapharmtech.com/tools/days-supply-calculator#step-5" } ] } ] }, { "@context": "https://schema.org", "@type": "EducationalOrganization", "name": "Alabama Pharmacy Tech Training", "url": "https://alabamapharmtech.com", "areaServed": "Alabama", "sameAs": [ "https://albop.com/" ] }, { "@context": "https://schema.org", "@type": "WebSite", "name": "Alabama Pharmacy Tech Training", "url": "https://alabamapharmtech.com", "inLanguage": "en-US" } ] --- [ Alabama Pharmacy Tech ALBOP Approved Training AL Pharm Tech ](/) [Shop](/shop)[Modules](/#modules)[Math Course](/pharmacy-math-practice)[Days Supply Calculator](/tools/days-supply-calculator)[Requirements](/alabama-requirements)[Blog](/blog)[Employers](/employers)[Contact](/contact) Student Login Login [Enroll Now](/register?utm_source=website&utm_medium=header&utm_campaign=header_nav) - [Home](/) - [Tools](/tools) - Days Supply Calculator # Days Supply Calculator Free days supply and prescription refill calculator for pharmacy technicians. Enter the quantity dispensed and the sig to get the day supply for tablets, liquids, inhalers, insulin, eye drops, and topicals, with the math shown step by step. ## The formula Days supply = total quantity dispensed divided by the amount used per day. The only part that changes by dosage form is how you measure the daily amount: tablets per day, mL per day, units per day, drops per day, puffs per day, or grams per day. ## Choose your medication type Pick the dosage form you are filling. The calculator jumps to the matching tab and the worked medication guides appear below. Tablets and capsules Pills, capsules, every other day and weekly sigs Liquids and suspensions mL per dose, mg to mL conversions, oral syringes Inhalers Total actuations divided by puffs per day Insulin and injectables Vials and pens converted to units per day Eye and ear drops mL to drops, one eye or both eyes Creams and patches Grams per application and patch change intervals Interactive calculator Select a medication type or pick a quick example below Tablets / Capsules Liquids Inhalers Insulin Eye / Ear Drops Creams / Patches Quick examples Metformin 500mg BID Lisinopril QD Amoxicillin TID Atorvastatin QD Prednisone QD Quantity Dispensed (tablets or capsules) Tablets per Dose Doses per Day QD=1 BID=2 TID=3 QID=4 Calculate Days Supply Quick examples Amoxicillin susp. TID Azithromycin QD Promethazine QHS Lactulose BID Quantity Dispensed (mL) Dose per Administration (mL) Doses per Day Calculate Days Supply Quick examples Albuterol (200 puffs) Flovent 44 (120 puffs) ProAir x2 inhalers Total Puffs per Inhaler Check inhaler label for total actuations Number of Inhalers Dispensed Puffs per Dose Doses per Day Calculate Days Supply Quick examples Lantus 10u QHS (vial) Humalog 20u TID (vial) Levemir pen BID 15u Package Type Vial (10 mL = 1,000 units) Pen (3 mL = 300 units per pen) Custom — enter units manually Number of Packages Units per Package Total Units per Day Add all doses (e.g. 10u AM + 30u PM = 40u/day) Calculate Days Supply Quick examples Latanoprost QHS (1 eye) Tobramycin QID (1 eye) Ciprofloxacin otic BID Prednisolone QID (both) Quantity Dispensed (mL) Drops per Dose 1 mL = approx. 20 drops Doses per Day Eye(s) / Ear(s) One (OD / OS / AD / AS) Both (OU / AU) Calculate Days Supply Quick examples Estrace cream (2x/wk) Triamcinolone BID Mupirocin TID Fentanyl patch q72h Lidoderm patch QD Medication Type Cream / Ointment / Gel Transdermal Patch Quantity Dispensed (grams) Grams per Application Applications per Day Patches Dispensed Patches per Day Change every 3 days = 0.33/day Calculate Days Supply Days Supply Clear and start over **Reference only.** Always verify in your pharmacy system. Consult the pharmacist for complex prescriptions. Insurance limits may vary. Don't see what you need? Suggest a medication and we will add it as a quick example. Suggest ## Alabama Days Supply Cheat Sheet One printable page with the days supply math Alabama pharmacies check at the bench and on every insurance claim. One-time download $1 - Tablets, capsules, and tapers using the whole number rounding Alabama pharmacies expect - Insulin vials and pens, with units per package worked out for you - Inhalers, puffs, eye drops, and mL to drops conversions - The same math taught in the ALBOP approved technician training program from Dalton Pharmacy Email for your access link Get the $1 cheat sheet The days supply calculator stays free. Built by Tyler Dalton, PharmD. ## Every free calculator in one place Need a faster answer for one dosage form or a refill date? These calculators run the same math with the package sizes and billing rules already built in. - [Free Tools Calculators and quick-reference guides for pharmacy technicians ](/tools) - [Refill Calculator Next refill date, run out date, and the earliest date insurance will pay ](/tools/refill-calculator) - [Insulin Day Supply Calculator Vials and pens converted to units, divided by total daily units ](/tools/insulin-day-supply-calculator) - [Eye Drop Day Supply Calculator mL to drops, one eye or both, with bottle size quick reference ](/tools/eye-drop-day-supply-calculator) - [Tablet Day Supply Calculator Pills and capsules, including every other day and weekly sigs ](/tools/tablet-day-supply-calculator) - [mg to mL Dose Calculator Convert a milligram dose to millilitres and get the liquid days supply ](/tools/liquid-dose-calculator) - [Cream Day Supply Calculator Grams per day with a fingertip unit chart by body area ](/tools/cream-day-supply-calculator) - [Inhaler Day Supply Calculator Actuations divided by puffs per day for albuterol and maintenance inhalers ](/tools/inhaler-day-supply-calculator) ## Meet your Alabama training requirement Days supply is the math you will use at the bench. Alabama Pharm Tech is ALBOP-approved training that walks you through this math step by step, plus everything else you need to finish on time. - ALBOP-approved training program - Start today, finish on your schedule - Pharmacy math practice with worked solutions - One payment of $199, everything included [Enroll Now - $199](/register?src=days-supply-calculator) ## Top drug day supply guides Worked examples for insulin, GLP-1s, inhalers, and the most searched medications. [ Lantus insulin glargine Example: 33 days ](/tools/days-supply-calculator/lantus)[ Humalog insulin lispro Example: 17 days ](/tools/days-supply-calculator/humalog)[ NovoLog insulin aspart Example: 33 days ](/tools/days-supply-calculator/novolog)[ Tresiba insulin degludec Example: 30 days ](/tools/days-supply-calculator/tresiba)[ Levemir insulin detemir Example: 19 days ](/tools/days-supply-calculator/levemir)[ Ozempic semaglutide Example: 28 days ](/tools/days-supply-calculator/ozempic)[ Mounjaro tirzepatide Example: 28 days ](/tools/days-supply-calculator/mounjaro)[ Wegovy semaglutide Example: 28 days ](/tools/days-supply-calculator/wegovy)[ Trulicity dulaglutide Example: 28 days ](/tools/days-supply-calculator/trulicity)[ Albuterol HFA albuterol sulfate Example: 25 days ](/tools/days-supply-calculator/albuterol)[ Symbicort budesonide/formoterol Example: 30 days ](/tools/days-supply-calculator/symbicort)[ Latanoprost latanoprost Example: 25 days ](/tools/days-supply-calculator/latanoprost)[ Metformin metformin Example: 30 days ](/tools/days-supply-calculator/metformin)[ Lisinopril lisinopril Example: 90 days ](/tools/days-supply-calculator/lisinopril) [Browse all 56 medication examples](/tools/days-supply-calculator/drugs) Looking for a medication that is not listed? [Browse all medication day supply guides](/tools/days-supply-calculator/drugs). ## How do you calculate days supply for tablets? Divide the quantity dispensed by the number of tablets taken per day. Daily tablets = tablets per dose × doses per day. For example, 90 tablets at 1 tablet twice daily (BID) = 90 ÷ 2 = **45 days supply**. ## How do you calculate days supply for insulin? A standard insulin vial is 10 mL at 100 units/mL = 1,000 total units. An insulin pen cartridge is 3 mL = 300 units. Multiply packages × units per package, then divide by total daily units. Example: 1 vial, 40 units/day = 1,000 ÷ 40 = **25 days**. ## How do you calculate days supply for eye drops? Convert mL to drops using the standard rate of 20 drops/mL, then divide by drops used per day (drops per dose × doses per day × number of eyes). For Latanoprost 2.5 mL, 1 drop at bedtime in one eye: 50 total drops ÷ 1 = **50 days supply**. ## How do you calculate days supply for inhalers? Total puffs = puffs per inhaler × number of inhalers. Daily puffs = puffs per dose × doses per day. Days supply = total puffs ÷ daily puffs. Albuterol 200 puffs, 2 puffs 4 times daily = 200 ÷ 8 = **25 days supply**. ## Frequently Asked Questions ### Why does days supply matter for insurance billing? Insurance plans set limits on how early a refill can be processed (usually when 75–80% of days supply is used). An incorrect days supply can cause claim rejections or allow early refills that are flagged as dispensing errors. ### What is the days supply formula for creams and ointments? Days supply = quantity dispensed (grams) ÷ (grams per application × applications per day). A 30 g tube used 1 g twice daily = 30 ÷ 2 = **15 days**. ### How do patches work for days supply? Days supply = patches dispensed ÷ patches used per day. A patch worn every 3 days = 0.33 patches/day. 30 patches ÷ 0.33 = **90 days supply**. ### Is this calculator approved for use in Alabama pharmacies? This tool is for educational and reference purposes only. Always confirm days supply calculations in your pharmacy dispensing system and consult the pharmacist for complex or ambiguous prescriptions. Alabama Pharm Tech ALBOP Approved Training ALBOP-approved pharmacy technician training program designed to meet all Alabama Board of Pharmacy requirements. 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