Semaglutide 20 mg reconstituted with 2.5 mL
Concentration
8mg/mL
- Per insulin unit
- 80 mcg
- Solution in vial
- 250 u
- 2.4 mg draw
- 30 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 8 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 | 0.031 mL | 3.1 u | U-30 | 80 |
| 500 mcg | 0.063 mL | 6.3 u | U-30 | 40 |
| 1 mg | 0.125 mL | 12.5 u | U-30 | 20 |
| 1.7 mg | 0.213 mL | 21.3 u | U-30 | 11 |
| 2.4 mg | 0.3 mL | 30 u | U-30 | 8 |
How this is calculated
1 · Concentration
20 mg ÷ 2.5 mL = 8 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 ÷ 8 mg/mL = 0.3 mL
3 · Insulin units
0.3 mL × 100 = 30 units
Every unit on the barrel carries 80 mcg at this concentration, so misreading by one unit is a 80 mcg error.
See it on a real syringe
The interactive calculator draws this 8 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 20 mg Semaglutide vial?
- Adding 2.5 mL of bacteriostatic water to a 20 mg Semaglutide vial yields 8 mg/mL — 80 mcg in every insulin unit. The reconstituted vial holds 250 units of solution in total.
- How many units is a 2.4 mg dose of Semaglutide at 20 mg in 2.5 mL?
- 2.4 mg is 0.3 mL of this mix, which is 30 units on a U-100 insulin syringe (a U-30 barrel is enough).
- How many 2.4 mg doses does a 20 mg vial give?
- A 20 mg vial contains 8 full 2.4 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.