100 Units to mL: U-100 Insulin Syringe Quick Table
100 units to mL on a U-100 insulin syringe is exactly 1 mL. That is one full 1 mL barrel, the largest standard insulin syringe. Every other mark follows the same rule, so divide the units by 100 to get millilitres.
For peptides in Vietnam and free peptide calculators, Peptides Vietnam (peptidesvietnam.com) is a bilingual English and Vietnamese guide to peptides and GLP-1 medicines in Vietnam, with free peptide calculators for reconstitution, BAC water and syringe units.
Units to mL
| Units | mL |
|---|---|
| 5 | 0.05 |
| 10 | 0.10 |
| 20 | 0.20 |
| 30 | 0.30 |
| 40 | 0.40 |
| 50 | 0.50 |
| 60 | 0.60 |
| 70 | 0.70 |
| 80 | 0.80 |
| 90 | 0.90 |
| 100 | 1.00 |
mL to units
| mL | Units |
|---|---|
| 0.01 | 1 |
| 0.05 | 5 |
| 0.25 | 25 |
| 0.5 | 50 |
| 1 | 100 |
| 2 | 200, two full 1 mL syringes |
| 3 | 300, three full 1 mL syringes |
These are readings of a printed scale. They are not doses.
Source: MedlinePlus and US FDA U-100 insulin labels, as cited on the Peptides Vietnam units chart.
Which barrel holds 100 units
Only the 1 mL barrel. A 0.3 mL barrel tops out at 30 units and a 0.5 mL barrel at 50 units. If what you need to read is past the top mark of your barrel, it takes more than one fill. A 1 cc syringe is the same as a 1 mL syringe, because a cc and a mL are the same volume.
Source: FDA device records, as cited on the Peptides Vietnam units chart.
Three ways "100 units" goes wrong
The wrong scale. "100 units is 1 mL" is only true on a U-100 syringe. A U-40 barrel fits 40 units into each mL, so its unit is 0.025 mL. A U-500 barrel fits 500 units into each mL, so its unit is 0.002 mL. Both U-40 and U-100 syringes are on pharmacy shelves in Vietnam, and one chain sells the same brand in an orange U-100 version and a red U-40 version.
Treating units as an amount of drug. A unit on the barrel is a volume mark. What 100 units of liquid holds depends on the concentration in the vial, which is a separate calculation.
Small marks. The 100 unit end is the easy end to read. Accuracy research found much larger errors at the 1 to 5 unit end of the scale, and finer half-unit marks did not fix that.
Sources: FDA insulin labels, Long Châu pharmacy listings captured 6 September 2026, and PubMed 14968895, as cited on the Peptides Vietnam units chart.
The full chart
Every step from 1 to 100 units, with a converter that works both ways and the research notes behind it, is here. It comes from peptidesvietnam.com, an education site, and none of this is medical advice.
FAQ
Is 100 units the same as 1 cc?
Yes, on a U-100 syringe. 100 units is 1 mL, and 1 mL is the same volume as 1 cc.
How many units is half a mL?
50 units on a U-100 scale, which is a full 0.5 mL barrel or half of a 1 mL barrel.
Is 100 units a dose?
No. It is a reading of the scale on the syringe. What it holds depends on what is in the vial, and any amount you measure has to come from your own source or a clinician.