mg to Units & Units to mL Converter
Convert insulin syringe units to mL and back, and turn an amount in mg or mcg into units at your vial's concentration. Type in either box; the other updates. Reference tables are below.
Units ⇄ mL
On a U-100 syringe, 100 units = 1 mL, so 1 unit = 0.01 mL.
mg ⇄ units
Concentration: 5 mg/mL (50 mcg per unit)
0.25 mg = 5 units = 0.05 mL
This is arithmetic on your inputs. VialVine doesn’t suggest amounts and isn’t a medical device. Always use the syringe type that matches what you’re measuring, and double-check every calculation.
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How to convert units, mL and mg
- Units to mL: divide by 100 on a U-100 syringe (divide by 40 on a U-40). 20 units = 0.2 mL; 50 units = 0.5 mL.
- mL to units: multiply by 100 on a U-100 syringe. 0.2 mL = 20 units; 0.5 mL = 50 units; 1 mL = 100 units.
- mg to units: you need the concentration first. Concentration (mg/mL) = mg in the vial ÷ mL of liquid added. Then units = mg ÷ concentration × 100.
- Example: a 10 mg vial with 2 mL added is 5 mg/mL. 1 mg ÷ 5 = 0.2 mL = 20 units. At 10 mg/mL, 1 mg is 10 units.
- mg and mL aren't interchangeable: mg is weight, mL is volume. How many mg are in a mL depends on how much was dissolved.
Units to mL chart (U-100 syringe)
On a U-100 insulin syringe, 100 units equal 1 mL.
| Units | mL (U-100) | mL (U-40) |
|---|---|---|
| 1 units | 0.01 mL | 0.025 mL |
| 2 units | 0.02 mL | 0.05 mL |
| 5 units | 0.05 mL | 0.125 mL |
| 10 units | 0.1 mL | 0.25 mL |
| 15 units | 0.15 mL | 0.375 mL |
| 20 units | 0.2 mL | 0.5 mL |
| 25 units | 0.25 mL | 0.625 mL |
| 30 units | 0.3 mL | 0.75 mL |
| 40 units | 0.4 mL | 1 mL |
| 50 units | 0.5 mL | 1.25 mL |
| 60 units | 0.6 mL | 1.5 mL |
| 70 units | 0.7 mL | 1.75 mL |
| 75 units | 0.75 mL | 1.875 mL |
| 80 units | 0.8 mL | 2 mL |
| 90 units | 0.9 mL | 2.25 mL |
| 100 units | 1 mL | 2.5 mL |
| 200 units | 2 mL | 5 mL |
| 240 units | 2.4 mL | 6 mL |
| 300 units | 3 mL | 7.5 mL |
| 500 units | 5 mL | 12.5 mL |
| 600 units | 6 mL | 15 mL |
| 1,000 units | 10 mL | 25 mL |
mg to units chart
Units on a U-100 syringe for common amounts, by how much is in the vial and how much liquid was added.
| Vial + liquid | mg/mL | 0.1 mg | 0.25 mg | 0.5 mg | 1 mg | 2 mg |
|---|---|---|---|---|---|---|
| 2 mg + 1 mL | 2 | 5 | 12.5 | 25 | 50 | 100 |
| 5 mg + 1 mL | 5 | 2 | 5 | 10 | 20 | 40 |
| 5 mg + 2 mL | 2.5 | 4 | 10 | 20 | 40 | 80 |
| 10 mg + 1 mL | 10 | 1 | 2.5 | 5 | 10 | 20 |
| 10 mg + 2 mL | 5 | 2 | 5 | 10 | 20 | 40 |
| 10 mg + 3 mL | 3.333 | 3 | 7.5 | 15 | 30 | 60 |
| 15 mg + 3 mL | 5 | 2 | 5 | 10 | 20 | 40 |
| 20 mg + 2 mL | 10 | 1 | 2.5 | 5 | 10 | 20 |
A 1 mL U-100 syringe holds 100 units. Draws under about 2 units are hard to read accurately.
Insulin syringe sizes
U-100 syringes come in three common sizes. Smaller barrels have finer markings.
| Syringe | Holds | Usual markings |
|---|---|---|
| 0.3 mL | 30 units | Every 1 unit (some every ½ unit) |
| 0.5 mL | 50 units | Every 1 unit |
| 1 mL | 100 units | Every 2 units |
Frequently asked questions
How many units are in 1 mL?
100 units on a U-100 insulin syringe, the most common type. A U-40 syringe (used for some pet insulins) holds 40 units per mL.
How much is 1 mg in units?
It depends on the concentration. At 5 mg/mL (10 mg in 2 mL) 1 mg is 20 units; at 10 mg/mL it's 10 units; at 2.5 mg/mL (5 mg in 2 mL) it's 40 units. Units = mg ÷ concentration (mg/mL) × 100.
How many units is 0.2 mL?
20 units on a U-100 syringe (0.2 × 100). On a U-40 syringe it's 8 units.
How many units is 0.5 mL?
50 units on a U-100 syringe. On a U-40 syringe it's 20 units.
How many mL is 10 units?
0.1 mL on a U-100 syringe (10 ÷ 100). On a U-40 syringe it's 0.25 mL.
How many mL is 600 units?
6 mL at 100 units per mL (600 ÷ 100). 240 units is 2.4 mL, and 1,000 units is 10 mL.
How much is 0.02 mg on a syringe?
It depends on the concentration. At 1 mg/mL, 0.02 mg (20 mcg) is 0.02 mL, or 2 units. At 5 mg/mL it's 0.4 units, too small to measure reliably, so a weaker concentration (more liquid) makes it readable.
How do I convert U-100 insulin units to mL?
Divide the units by 100. 35 units is 0.35 mL. For U-40 insulin, divide by 40, and always measure it with a U-40 syringe; U-40 and U-100 syringes are marked differently.
Is mg the same as mL?
No. mg (milligrams) measure weight and mL (milliliters) measure volume. For water they line up roughly 1 mL = 1,000 mg, but for a dissolved peptide, the mg per mL depends entirely on how much was mixed in.
How many mcg is 1 unit?
On a U-100 syringe, 1 unit = 0.01 mL, so mcg per unit = concentration (mg/mL) × 10. At 5 mg/mL, 1 unit holds 50 mcg; at 2 mg/mL, 20 mcg.
Related reading on Aminodex
- Compound library for plain-language reference profiles with cited research.
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