Peptide LibraryHow many units is 100 mcg?
100 mcg is 2 units on a U-100 insulin syringe when the solution is 5 mg/mL (a 10 mg vial mixed with 2 mL of water), which is 0.02 mL. The number of units depends on the concentration: from 1 units at 10 mg/mL to 4 units at 2.5 mg/mL.
For research use only. Not medical advice. This page converts an amount; it does not recommend one.
100 mcg at common concentrations
| Vial and water | Concentration | Volume | U-100 units | U-40 units |
|---|---|---|---|---|
| 5 mg in 2 mL | 2.5 mg/mL | 0.04 mL | 4 units | 1.6 units |
| 10 mg in 3 mL | 3.33 mg/mL | 0.03 mL | 3 units | 1.2 units |
| 10 mg in 2 mL | 5 mg/mL | 0.02 mL | 2 units | 0.8 units |
| 15 mg in 2 mL | 7.5 mg/mL | 0.013 mL | 1.3 units | 0.5 units |
| 10 mg in 1 mL | 10 mg/mL | 0.01 mL | 1 units | 0.4 units |
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.
Is 100 mcg a typical amount?
This page converts 100 mcg because people search for that number. It is not a suggested amount; Peptide Library does not recommend doses. The library's profiles list what published studies used, with sources.