units = mL × scale (scale = 100 on U-100)
Units to mL chart
| Units | U-100 (mL) | U-50 (mL) | U-40 (mL) |
|---|---|---|---|
| 1 | 0.01 | 0.02 | 0.025 |
| 2 | 0.02 | 0.04 | 0.05 |
| 4 | 0.04 | 0.08 | 0.1 |
| 5 | 0.05 | 0.1 | 0.125 |
| 8 | 0.08 | 0.16 | 0.2 |
| 10 | 0.1 | 0.2 | 0.25 |
| 12 | 0.12 | 0.24 | 0.3 |
| 15 | 0.15 | 0.3 | 0.375 |
| 20 | 0.2 | 0.4 | 0.5 |
| 25 | 0.25 | 0.5 | 0.625 |
| 30 | 0.3 | 0.6 | 0.75 |
| 35 | 0.35 | 0.7 | 0.875 |
| 40 | 0.4 | 0.8 | 1 |
| 50 | 0.5 | 1 | — |
| 60 | 0.6 | — | — |
| 70 | 0.7 | — | — |
| 75 | 0.75 | — | — |
| 80 | 0.8 | — | — |
| 90 | 0.9 | — | — |
| 100 | 1 | — | — |
Dashes mark readings beyond a standard 1 mL U-50 or U-40 barrel.
How do U-100, U-40 and U-50 syringes differ?
Insulin syringes are printed in "units" because they were designed for insulin, which is sold at a fixed number of units per mL. A U-100 syringe matches U-100 insulin (100 units per mL), and that is the barrel almost everyone means when they say "units". U-40 syringes are made for U-40 insulin, which is mostly used in veterinary practice. The same printed number on a U-40 barrel is 2.5 times the volume of a U-100 reading.
More detail on barrel sizes and tick marks: insulin syringe guide.
How do you convert mcg to mL?
Micrograms are an amount and milliliters are a volume, so the conversion needs the concentration of the solution. Change mcg to mg (divide by 1,000), then divide by the concentration in mg/mL. For example, 250 mcg is 0.25 mg, and 0.25 mg ÷ 5 mg/mL = 0.05 mL, or 5 units on a U-100 syringe.
U-100 units = mL × 100
| mcg | 1 mg/mL | 2.5 mg/mL | 5 mg/mL | 10 mg/mL |
|---|---|---|---|---|
| 50 | 0.05 mL (5 u) | 0.02 mL (2 u) | 0.01 mL (1 u) | 0.005 mL (0.5 u) |
| 100 | 0.1 mL (10 u) | 0.04 mL (4 u) | 0.02 mL (2 u) | 0.01 mL (1 u) |
| 200 | 0.2 mL (20 u) | 0.08 mL (8 u) | 0.04 mL (4 u) | 0.02 mL (2 u) |
| 250 | 0.25 mL (25 u) | 0.1 mL (10 u) | 0.05 mL (5 u) | 0.025 mL (2.5 u) |
| 300 | 0.3 mL (30 u) | 0.12 mL (12 u) | 0.06 mL (6 u) | 0.03 mL (3 u) |
| 500 | 0.5 mL (50 u) | 0.2 mL (20 u) | 0.1 mL (10 u) | 0.05 mL (5 u) |
| 750 | 0.75 mL (75 u) | 0.3 mL (30 u) | 0.15 mL (15 u) | 0.075 mL (7.5 u) |
| 1000 | 1 mL (100 u) | 0.4 mL (40 u) | 0.2 mL (20 u) | 0.1 mL (10 u) |
Common concentrations: 1 mg/mL is 2 mg in 2 mL, 2.5 mg/mL is 5 mg in 2 mL, 5 mg/mL is 10 mg in 2 mL and 10 mg/mL is 20 mg in 2 mL. For any other vial and water volume, use the mg and mcg to units converter or the reconstitution calculator.
Frequently asked questions
How many mL is 10 units on an insulin syringe?
On a U-100 syringe, 10 units = 0.1 mL. On a U-40 syringe, 10 units = 0.25 mL. On a U-50 syringe, 10 units = 0.2 mL.
How many units are in 1 mL?
It depends on the syringe scale: 100 units on U-100, 50 on U-50 and 40 on U-40. The "U" number is literally units per milliliter.
Is 0.1 mL the same as 10 units?
On a U-100 syringe, yes. 0.1 mL × 100 units/mL = 10 units.
How many units is 0.25 mL?
25 units on U-100, 12.5 on U-50 and 10 on U-40.
How many mL is 250 mcg?
It depends on the concentration in the vial. At 5 mg/mL (for example 10 mg in 2 mL), 250 mcg is 0.25 ÷ 5 = 0.05 mL, which is 5 units on a U-100 syringe. At 2.5 mg/mL it is 0.1 mL (10 units).
Does the units-to-mL conversion depend on the peptide?
No. Units to mL depends only on the syringe scale. What a unit contains (in mg) depends on the concentration in the vial; that is a separate step done by the mg to units converter.
Sources
Links checked 2026-10-19.