GLP-1 Dose Calculator, Convert Your mg Dose to Syringe Units
Enter your prescribed dose in mg and your vial concentration, and get the exact number of units to draw on a standard U-100 insulin syringe, plus the typical semaglutide and tirzepatide titration schedule. Built for compounded and vial-based GLP-1 prescriptions.
Reading the wrong syringe mark is the most common dosing mistake. This tool gives you the exact unit mark, then always verify it with your pharmacist.
Most dose charts stop at the mg. This calculator translates your mg dose into the exact syringe units for your specific vial concentration, then lines it up against the standard titration ladder, so you know both what to draw today and what comes next.
mg to units
What you get
~10 sec
To your result
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Work out your dose in units
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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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Sources and references
This page is built from public clinical guidance and peer-reviewed research. Always confirm decisions with a licensed clinician.
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Frequently Asked Questions
Frequently Asked Questions
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
June 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
Meet Akabari
·Co-Founder, Calqulate.net