GLP-1 Dose Calculator
Understand your prescribed dose, treatment stage, and mg-to-syringe conversion.
Built for people on semaglutide and tirzepatide — Ozempic®, Wegovy®, Mounjaro®, Zepbound® and compounded vials. Educational only, not a prescription.
Use only the dose and concentration provided by your clinician or pharmacy. Units depend on your specific vial concentration and can change between refills. This tool does the math — it does not set your dose.
Verify this against your prescription label and syringe before injecting. If anything differs — the mg, the mL, the mg/mL concentration, or the unit mark on your syringe — stop and ask your pharmacist.
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How the mg-to-units conversion works
If your GLP-1 comes in a vial, your prescription is written in milligrams but your syringe is marked in units. Those are two different things, and the bridge between them is the concentration of your vial, measured in mg per mL. The volume you draw is simply your dose divided by that concentration.
On a standard U-100 insulin syringe, 100 units fill 1 mL, so every unit is 0.01 mL. That means the units to draw are your volume in mL multiplied by 100. For example, a 1 mg dose from a 2 mg/mL vial is 0.5 mL, which is 50 units. The calculator above does this for you and shows both the exact and the rounded units so you can read your syringe with confidence.
The one thing to remember
Units to draw = (dose in mg ÷ concentration in mg/mL) × 100
Titration in brief
GLP-1 doses start low and step up over several weeks so your body can adjust and side effects stay manageable. Increases usually happen every four weeks when the current dose is well tolerated, though your prescriber may hold you longer. Each medication has its own ladder, so for the full week-by-week schedule use the dedicated calculator below.
Semaglutide (Wegovy)
Starts at 0.25 mg weekly and steps up to a 2.4 mg maintenance dose, typically over about 16 weeks.
See the full semaglutide scheduleTirzepatide (Zepbound / Mounjaro)
Starts at 2.5 mg weekly and increases by 2.5 mg every four weeks up to a maximum of 15 mg.
See the full tirzepatide scheduleDraw safely, every time
- Confirm the concentration printed on your current vial before you calculate. A new batch can have a different mg/mL.
- Read the units against the markings on your specific syringe. Not all insulin syringes look the same.
- If the calculator and your prescription label ever disagree, stop and call your pharmacist.
- Never adjust your own dose to speed up results. Faster is not better and it raises your side-effect risk.
Your dose is an input, not the goal
Getting your units right is step one. What decides whether the weight you lose stays off is how much of it is fat versus muscle. If your appetite has cratered and protein has slipped, a good dose can still come with muscle loss. Check where you stand with the body composition tracker.
Are you losing fat or muscle?
Get an instant estimate of your fat-versus-muscle split.
On a GLP-1? Keep every dose and result on one timeline
This calculator handles a single injection. What protects your results over months is logging every dose, weight and symptom consistently. Calqulate Vitals keeps all of that in one place, shows how much medication is still working today, and checks you against the clinical trials, all free. Premium adds fat-versus-muscle trends and dose timing.
- Log every dose, weight and symptom in seconds
- See how much medication is still working today
- Know if you are on track against the clinical trials
- Lean-mass trend and dose timing (Premium)
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Save this dose to my GLP-1 timeline
Add today's dose to your timeline in one tap. Every dose lands on the same chart so you can see your titration, side-effect windows and injection days at a glance.
- Every dose on one timeline
- Injection-day reminders
- See titration and side-effect windows together
- Export to your prescriber as PDF
Your entries are private. Export or delete any time.
Related calculators and trackers
Related in your GLP-1 journey
Full GLP-1 hub →Sources and references
This page is built from public clinical guidance and peer-reviewed research. Always confirm decisions with a licensed clinician.
Related GLP-1 Calculators
Explore the rest of our glp-1 tools — each one adds a different piece of the picture.
Frequently Asked Questions
Frequently Asked Questions
Common questions and answers about this calculator.
How do I convert my GLP-1 dose in mg to syringe units?
You need two numbers: your prescribed dose in mg and the concentration of your vial in mg/mL. The volume to draw is dose divided by concentration, and on a standard U-100 insulin syringe every 0.01 mL equals one unit, so units are that volume multiplied by 100. This calculator does the arithmetic for you and shows both the exact and rounded units. Always confirm the concentration printed on your current vial before drawing.
What is a U-100 insulin syringe and why does it matter?
A U-100 syringe is marked in insulin units where 100 units equals 1 mL, so each unit is 0.01 mL. Compounded GLP-1 medications are often supplied in vials and drawn with these syringes, which is why your dose in mg has to be translated into units. Reading the wrong marking is the most common dosing mistake, so the calculator gives you the exact unit mark to draw to.
Is this calculator a prescription or medical advice?
No. It is an educational tool that does the mg-to-units math and shows the standard titration ladders from public prescribing information. It does not set your dose or replace your prescriber or pharmacist. Always follow the dose your clinician prescribed and verify the units with your pharmacist before injecting.
What is titration and why do GLP-1 doses start low?
Titration is the gradual step-up from a low starting dose to a higher maintenance dose over several weeks. GLP-1 medications start low because it lets your body adjust and keeps side effects like nausea more manageable. Doses usually increase every four weeks when the current dose is well tolerated, though your prescriber may hold you at a dose longer.
What are the standard semaglutide and tirzepatide schedules?
For semaglutide (Wegovy) the common ladder is 0.25 mg for weeks 1 to 4, 0.5 mg for weeks 5 to 8, 1.0 mg for weeks 9 to 12, 1.7 mg for weeks 13 to 16, then 2.4 mg weekly for maintenance. For tirzepatide (Zepbound, Mounjaro) it typically starts at 2.5 mg, then 5 mg, and increases by 2.5 mg every four weeks up to a maximum of 15 mg. These are general references from the FDA labels, not a prescription for you.
Does the calculator store what I enter?
No. The calculation happens in your browser and nothing you type is saved or sent anywhere. It is private by design.
Medical Disclaimer: This tool is for informational purposes only. It performs a dose-to-units calculation and shows general titration references, not medical advice or a prescription. Always follow the dose your clinician prescribed and verify units with your pharmacist before injecting, especially if you have underlying conditions or take other medications.
Tool Information
August 2026
Dr. Jaydeep Sanghani
Meet Akabari
Dr. Jaydeep Sanghani
MBBS, MD, DNB(Anaesth.), PDCC(CCM), DrNB(CCM)
AIIMS Bhubaneswar · AIIMS Rishikesh
Critical care specialist and anesthesiologist with advanced training from AIIMS. Reviews health calculators at Calqulate to ensure medical accuracy and evidence-based standards.
About the authors
