Syringe Units (Insulin Units)
The tick marks on an insulin syringe (100 units = 1 mL) used to measure a draw.
Syringe units are the graduations on an insulin syringe, where 100 units equal 1 milliliter. Because these small markings are easier to read than fractions of a milliliter, reconstituted peptides are often measured in syringe units.
PeptideWiz converts a dose and concentration into syringe units so what you record matches what you measure on the syringe. This is a measurement aid, not medical instruction.
Not medical advice. PeptideWiz is a tracking and organization tool. These definitions are general education only — not medical advice, a recommendation, or instructions for use. Always work with a licensed medical provider.
Frequently asked questions
How many units are in 1 mL on an insulin syringe?
On a standard U-100 insulin syringe, 100 units equal 1 mL, so each unit is 0.01 mL. This is a fixed property of the syringe, not a dose. For guidance on reading a U-100 syringe, see MedlinePlus.
How many units is 0.25 mg on an insulin syringe?
It depends on the concentration, because units measure volume, not milligrams. As an arithmetic example, at 2.5 mg/mL a 0.25 mg amount is 0.1 mL, which is 10 units on a U-100 syringe (since 100 units = 1 mL). This is an example of the math only and not a recommended dose; use the converter to work through your own numbers.
How do I convert mL to insulin syringe units?
Multiply the volume in mL by 100, because a U-100 syringe has 100 units per mL. For example, 0.2 mL equals 0.2 × 100 = 20 units, and 0.05 mL equals 5 units. The PeptideWiz calculator shows this conversion as a general-education aid, not medical advice.
Are insulin syringe units the same as milligrams?
No. Units on an insulin syringe measure volume (100 units = 1 mL), while milligrams measure the mass of peptide. To connect the two you need the concentration in mg/mL. Mixing these up is a common error, so PeptideWiz keeps volume and mass separate in its converter.
Why does my insulin syringe show units instead of mL?
U-100 insulin syringes are marked in units because they were designed for insulin, where 100 units equals 1 mL. You can still read volume from them: every 10 units is 0.1 mL. For instructions on reading these tick marks, see MedlinePlus; any amount to draw should be directed by your provider.