Semaglutide 15 mg reconstituted with 5 mL
Concentration
3mg/mL
- Per insulin unit
- 30 mcg
- Solution in vial
- 500 u
- 2.4 mg draw
- 80 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 3 mg/mL
Insulin syringes are graduated in hundredths of a millilitre, so units = mL × 100 on a U-100, U-50 or U-30 barrel alike.
| Dose | Volume | U-100 units | Fits | Doses per vial |
|---|---|---|---|---|
| 250 mcg | 0.083 mL | 8.3 u | U-30 | 60 |
| 500 mcg | 0.167 mL | 16.7 u | U-30 | 30 |
| 1 mg | 0.333 mL | 33.3 u | U-50 | 15 |
| 1.7 mg | 0.567 mL | 56.7 u | U-100 | 8 |
| 2.4 mg | 0.8 mL | 80 u | U-100 | 6 |
How this is calculated
1 · Concentration
15 mg ÷ 5 mL = 3 mg/mL
The peptide mass never changes — bacteriostatic water only sets how concentrated the solution is, and therefore how far the plunger travels.
2 · Volume for a 2.4 mg dose
2.4 mg ÷ 3 mg/mL = 0.8 mL
3 · Insulin units
0.8 mL × 100 = 80 units
Every unit on the barrel carries 30 mcg at this concentration, so misreading by one unit is a 30 mcg error.
See it on a real syringe
The interactive calculator draws this 3 mg/mL mix on a scaled U-100 barrel, shows when a draw lands exactly on a printed tick, and works backwards from a target dose to the water volume that makes it land cleanly.
Open the interactive calculator →Common questions
- How much bacteriostatic water for a 15 mg Semaglutide vial?
- Adding 5 mL of bacteriostatic water to a 15 mg Semaglutide vial yields 3 mg/mL — 30 mcg in every insulin unit. The reconstituted vial holds 500 units of solution in total.
- How many units is a 2.4 mg dose of Semaglutide at 15 mg in 5 mL?
- 2.4 mg is 0.8 mL of this mix, which is 80 units on a U-100 insulin syringe (a U-100 barrel is enough).
- How many 2.4 mg doses does a 15 mg vial give?
- A 15 mg vial contains 6 full 2.4 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.