On a standard U-100 insulin syringe, 100 units = 1 mL, so 1 unit = 0.01 mL. This holds on every U-100 syringe; the 30/50/100 label is the maximum volume, not a different scale. Use the quick-reference table below to convert any number of units to millilitres.
Units to mL quick-reference table (U-100)
| Units | Millilitres (U-100) |
|---|---|
| 1 U | 0.01 mL |
| 2 U | 0.02 mL |
| 5 U | 0.05 mL |
| 10 U | 0.10 mL |
| 15 U | 0.15 mL |
| 20 U | 0.20 mL |
| 25 U | 0.25 mL |
| 30 U | 0.30 mL |
| 40 U | 0.40 mL |
| 50 U | 0.50 mL |
| 100 U | 1.00 mL |
How many mL is X units of insulin?
Because 1 unit is 0.01 mL on a U-100 syringe, you convert units to millilitres by dividing by 100 (or multiplying by 0.01). The common values people look up:
- How many mL is 5 units of insulin? 5 units = 0.05 mL.
- How many mL is 10 units? 10 units = 0.10 mL (one tenth of a millilitre).
- How many mL is 20 units? 20 units = 0.20 mL.
- How many mL is 50 units? 50 units = 0.50 mL (half a millilitre).
- How many mL is 100 units of insulin? 100 units = 1.00 mL — a full standard U-100 syringe.
To go the other way, multiply millilitres by 100: 0.30 mL is 30 units, 0.5 mL is 50 units, and 1 mL is 100 units.
U-100, U-50 and U-30 syringe scales
The number on an insulin syringe is its maximum volume, not a change to the unit scale. All three are marked in U-100 units — the same 1 unit = 0.01 mL — they simply hold different totals:
| Syringe | Max volume | Max units |
|---|---|---|
| U-30 | 0.3 mL | 30 U |
| U-50 | 0.5 mL | 50 U |
| U-100 | 1.0 mL | 100 U |
A smaller syringe (U-30 or U-50) spreads the same units over more physical length, so each unit is easier to read precisely — useful for small draws. If a draw would exceed the syringe's maximum (for example 60 units in a U-50), you need a larger syringe or a more dilute preparation.
Turning a peptide dose into units
To convert a reconstituted peptide dose into the units shown on these syringes, use the reconstitution calculator. To work backwards from a unit draw to the mass it represents, use the units-to-mg calculator, and for plain mass conversions see the mg / mcg converter.
Reference values are approximate and compiled for education only — not medical advice and not dosing guidance. Half-lives and concentrations vary by source, formulation and individual. Always verify against primary literature and your material's certificate of analysis.