Peptide LibraryHow many units is 0.25 mL on an insulin syringe?
0.25 mL is 25 units on a U-100 insulin syringe and 10 units on a U-40 syringe. Units measure volume only; how many mg that volume holds depends on the concentration of the solution.
For research use only. Not medical advice. This page converts an amount; it does not recommend one.
What 0.25 mL holds at common concentrations
| Vial and water | Concentration | Amount in that volume |
|---|---|---|
| 5 mg in 2 mL | 2.5 mg/mL | 0.625 mg (625 mcg) |
| 10 mg in 3 mL | 3.33 mg/mL | 0.833 mg (833 mcg) |
| 10 mg in 2 mL | 5 mg/mL | 1.25 mg (1,250 mcg) |
| 15 mg in 2 mL | 7.5 mg/mL | 1.875 mg (1,875 mcg) |
| 10 mg in 1 mL | 10 mg/mL | 2.5 mg (2,500 mcg) |
Concentration is the mg in the vial divided by the mL of water added. Units measure volume: 100 units fill 1 mL on a U-100 syringe.
Convert another amount
At 5 mg/mL on a U-100 syringe.
Draw 0.50 mL (≈ 50 units on a 0.5 mL syringe)
Common questions
Do insulin syringe units depend on the peptide?
No. Units are marks of volume: on a U-100 syringe, 100 units fill 1 mL. What changes between peptides is the concentration of the solution, which is the mg in the vial divided by the mL of water added.
What if my syringe is U-40?
A U-40 syringe has 40 marks per mL, so the same volume reads as 2.5 times fewer units. Read the scale printed on the syringe and use the matching column.