Semaglutide dose calculator
Convert your semaglutide vial, BAC water, and prescribed dose into insulin-syringe units — instantly. Free, no account, nothing leaves your browser. Works for compounded semaglutide.
Draw to
5 units
on a U-100 insulin syringe (0.05 mL)
Concentration
5 mg/mL
Doses per vial
~20
How it works: concentration = vial strength ÷ BAC water. Volume to draw = your dose ÷ concentration. On a U-100 insulin syringe, 100 units = 1 mL, so units = volume × 100. Always confirm your semaglutide vial strength and prescribed dose with your prescriber or pharmacist — this tool is for educational reference only and is not medical advice.
How semaglutide reconstitution works
Compounded semaglutide typically arrives as a freeze-dried powder you reconstitute with bacteriostatic water. Your vial strength (total mg) and the BAC water you add set the concentration (mg/mL), which tells you how many units to draw. Because semaglutide doses are small, getting the concentration right matters. Once you know it, log every injection and your titration in the private compounded semaglutide tracker, and see the semaglutide weight-loss timeline.
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Frequently asked questions
How do I convert semaglutide mg to units?
Find your concentration by dividing the vial strength (mg) by the bacteriostatic water you added (mL). Then divide your prescribed dose (mg) by that concentration to get the volume in mL, and multiply by 100 for units on a U-100 insulin syringe. For example, a 5 mg vial reconstituted with 1 mL of BAC water is 5 mg/mL; a 0.25 mg dose is 0.05 mL, which is 5 units.
How much bacteriostatic water do I add to a semaglutide vial?
It depends on the vial and the concentration your provider wants. 1 mL or 2 mL of bacteriostatic water are common. Because semaglutide doses are small (often 0.25–2.4 mg), many people use a concentration that puts their dose in an easy-to-read range on the syringe. Always follow your compounding pharmacy or prescriber's reconstitution instructions.
What syringe should I use?
This calculator assumes a standard U-100 insulin syringe, where 100 units equals 1 mL. If you use a different syringe, the markings may differ — verify against the actual volume in mL.
Is this calculator medical advice?
No. It is an educational reference tool. Compounded semaglutide is not FDA-approved and concentrations vary between pharmacies. Always confirm your vial strength, reconstitution, and dose with your prescriber or pharmacist before injecting.
This calculator is for general educational purposes only and is not medical advice. Compounded semaglutide is not FDA-approved and formulations vary. Always confirm your vial strength, reconstitution, and dose with your prescriber or pharmacist before injecting.