This free semaglutide units calculator converts your prescribed dose in milligrams (mg) into insulin-syringe units and milliliters (mL), based on your vial’s concentration. It works for compounded semaglutide and compounded tirzepatide alike — the math is the same. Always confirm the result with your pharmacy before drawing a dose.
How the Semaglutide Units Calculator Works
Compounded semaglutide comes in multi-dose vials labeled with a concentration — commonly 1, 2.5, or 5 mg/mL — and you draw each dose with a U-100 insulin syringe, where 100 units equal 1 mL. The conversion is: mL = your dose in mg ÷ vial concentration in mg/mL, and units = mL × 100. So a 0.5 mg dose from a 2.5 mg/mL vial is 0.2 mL, or 20 units. The same math applies to compounded tirzepatide.
This is exactly where branded pens and compounded vials differ: pens meter the dose for you, vials don’t. That makes unit conversion the single most important safety habit for compounded users — the FDA has specifically warned about dosing errors with compounded GLP-1s.
Semaglutide Units Calculator FAQ
How many units is 0.25 mg of semaglutide?
It depends entirely on your vial’s concentration. At 1 mg/mL it’s 25 units; at 2.5 mg/mL it’s 10 units. Never reuse someone else’s unit count — their vial may be a different strength.
What’s the difference between units, mL, and mg?
Mg is the amount of medication (what your prescription specifies), mL is liquid volume, and units are the markings on a U-100 insulin syringe (100 units = 1 mL). The concentration on your vial links the three.
Does this work for compounded tirzepatide?
Yes — the formula is identical for any injectable measured from a vial with a U-100 syringe. Just use your tirzepatide vial’s mg/mL concentration.
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This calculator is for educational purposes only and is not medical advice. Always confirm doses and conversions with your pharmacist and prescriber before injecting.