300 mcg to units
300 mcg (0.3 mg) is 12 units on a U-100 insulin syringe when the vial is 2.5 mg/mL, and 6 units at 5 mg/mL. The answer changes with concentration: units = mg ÷ mg/mL × 100.
300 mcg in units, by concentration
Find the concentration of your vial in the left column. If you do not know it, divide the mg in the vial by the mL of water added.
| Concentration | Volume | 300 mcg = |
|---|---|---|
| 1 mg/mL · 5 mg vial + 5 mL | 0.3 mL | 30 units |
| 2 mg/mL · 10 mg vial + 5 mL | 0.15 mL | 15 units |
| 2.5 mg/mL · 5 mg vial + 2 mL | 0.12 mL | 12 units |
| 3 mg/mL · 15 mg vial + 5 mL | 0.1 mL | 10 units |
| 5 mg/mL · 10 mg vial + 2 mL | 0.06 mL | 6 units |
| 7.5 mg/mL · 15 mg vial + 2 mL | 0.04 mL | 4 units |
| 10 mg/mL · 10 mg vial + 1 mL | 0.03 mL | 3 units |
| 15 mg/mL · 30 mg vial + 2 mL | 0.02 mL | 2 units |
| 20 mg/mL · 20 mg vial + 1 mL | 0.015 mL | 1.5 units · too small to read reliably |
300 mcg in units, by vial size and water added
The same conversion, starting from what is printed on the vial and how much bacteriostatic water went in.
| Vial | 1 mL water | 2 mL water | 3 mL water |
|---|---|---|---|
| 2 mg | 15 units | 30 units | 45 units |
| 5 mg | 6 units | 12 units | 18 units |
| 10 mg | 3 units | 6 units | 9 units |
| 15 mg | 2 units | 4 units | 6 units |
Calculate for your vial
The amount is filled in. Add your vial size and the water added.
Enter the vial size and the water you added.
Arithmetic only. This tool does not recommend a dose; use the one your prescriber gave you.
Questions
How many units is 300 mcg?
It depends on the concentration of the vial. At 2.5 mg/mL (5 mg vial + 2 mL) 300 mcg is 12 units on a U-100 insulin syringe. At 5 mg/mL (10 mg vial + 2 mL) it is 6 units.
Why is there no single answer for 300 mcg in units?
Units measure volume: 100 units is 1 mL. Milligrams and micrograms measure the amount of substance. The link between them is the concentration, which is set by how much water was added to the vial.
How many mL is 300 mcg?
Divide 0.3 mg by the concentration in mg/mL. At 2.5 mg/mL that is 0.12 mL; at 5 mg/mL it is 0.06 mL.
How many mg is 300 mcg?
300 mcg is 0.3 mg. There are 1,000 mcg in 1 mg.
What if 300 mcg comes to less than 2 units?
Below about 2 units the marks on an insulin syringe are too coarse to read reliably. At 20 mg/mL, 300 mcg is under 2 units. A weaker mix (more water in the same vial) makes the same amount a larger, easier volume to read.
The same amount written the other way: 0.3 mg to units.
Nearby conversions
- 150 mcg to units
- 200 mcg to units
- 250 mcg to units
- 400 mcg to units
- 500 mcg to units
- 600 mcg to units
- 0.25 mg to units
- 0.3 mg to units
- 75 units to mg
- 30 units to mL
- 0.1 mL to units
- mcg to mg
- All conversions