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GLP-1 pen calculator: how long will my pens last and what do they cost?
For people already prescribed GLP-1 medication. Weight Easy does not prescribe, sell or arrange medication. Your prescriber makes treatment and dose decisions.
By the Weight Easy Editorial Team ·
✓ Free to download
Quick answer: A multi-dose GLP-1 pen such as the Mounjaro KwikPen or Wegovy FlexTouch holds 4 weekly doses, so one pen lasts 4 weeks. Single-dose pens and vials last 1 week each. Add your doses left and unopened pens to see your run-out date, when to reorder, and your cost per dose, month and year.
Weekly injections
- Mounjaro (tirzepatide)
- Zepbound (tirzepatide)
- Ozempic (semaglutide)
- Wegovy (semaglutide)
- Generic semaglutide for diabetes (Obeda, Sematrinity, GLIPIQ)
- Generic semaglutide for weight (Noveltreat)
- Yurpeak (tirzepatide)
- Compounded semaglutide
- Compounded tirzepatide
- Trulicity (dulaglutide)
- Bydureon BCise (exenatide extended-release)
Daily injections
- Saxenda (liraglutide)
- Victoza or generic liraglutide
- Byetta (exenatide)
Daily tablets
- Wegovy pill (oral semaglutide)
- Rybelsus 1.5, 4 or 9 mg, or Ozempic tablets (oral semaglutide)
- Rybelsus 3, 7 or 14 mg (oral semaglutide)
- Foundayo (orforglipron)
- 4-dose pen (KwikPen, FlexTouch)
- Single-dose pen or vial
- Other (enter doses per pen)
4-dose pens: Mounjaro KwikPen, Wegovy FlexTouch. Single-dose: US Mounjaro, Zepbound, Wegovy and vials. Check your box.
Pharmacy delivery or prescription time. We use 7 days if you leave it blank.
- ₹ Indian rupee
- £ British pound
- $ US dollar
- A$ Australian dollar
- C$ Canadian dollar
Fill in the form to see your result
Still needed: your medication, pen type, doses left, unopened pens, date of your next dose.
Works with: Mounjaro, Zepbound, Ozempic, Wegovy, Wegovy pill, Rybelsus, Ozempic tablets, Saxenda, Victoza, Trulicity, Bydureon BCise, Byetta, Foundayo, Yurpeak, Obeda, Noveltreat, Semaglyn, Sematrinity, GLIPIQ, compounded semaglutide, compounded tirzepatide.
Free to download
Keep every dose in one place
Weight Easy logs every pen or vial dose with its date, so you always know what you took and when. Your dose history is there when you talk to your doctor or pharmacy.
- Every dose logged with its date and dose
- See your cycle day and when your next dose is due
- Shot-day reminders on your schedule
- Full dose history in one place
Free to download. Subscription for full features, with a 7-day free trial on the yearly plan. For people already prescribed GLP-1 medicine. Weight Easy does not prescribe, sell or arrange medicine. Follow the treatment instructions from your prescribing clinician.
Read the complete guide
The calculator stays free on this page. Its longer explanatory article, medicine-specific FAQ and cited sources live in the Weight Easy blog, alongside the other health and tracking guides.
Read the guide and FAQ →Related guides
- Mounjaro Price and Availability GuideFind out about Mounjaro's pricing and availability, with insights into access considerations for this weight loss medication.
- Wegovy Price and Availability GuideOverview of common questions about Wegovy pricing and availability, including access themes and considerations globally.
- Zepbound Price and Availability GuideA practical guide to Zepbound pricing and access in the U.S., including current self-pay pricing, insurance hurdles, LillyDirect options, and supply realities in 2026.
- Cheapest Semaglutide in India: Price Comparison Across Major BrandsA practical 2026 guide to semaglutide prices in India, including Ozempic, Rybelsus, and newer local brands.
Sources and limits
- Mounjaro KwikPen, Wegovy FlexTouch, Zepbound and Wegovy single-dose pen instructions for use.
- Cost figures are calculated from the price you enter; we don't store it.
This tool is for education. It does not diagnose, prescribe or change a dose. Always follow your prescriber and the leaflet that came with your medication.