400 mcg to units
400 mcg (0.4 mg) is 16 units on a U-100 insulin syringe when the vial is 2.5 mg/mL, and 8 units at 5 mg/mL. The answer changes with concentration: units = mg ÷ mg/mL × 100.
400 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 | 400 mcg = |
|---|---|---|
| 1 mg/mL · 5 mg vial + 5 mL | 0.4 mL | 40 units |
| 2 mg/mL · 10 mg vial + 5 mL | 0.2 mL | 20 units |
| 2.5 mg/mL · 5 mg vial + 2 mL | 0.16 mL | 16 units |
| 3 mg/mL · 15 mg vial + 5 mL | 0.1333 mL | 13.33 units |
| 5 mg/mL · 10 mg vial + 2 mL | 0.08 mL | 8 units |
| 7.5 mg/mL · 15 mg vial + 2 mL | 0.05333 mL | 5.333 units |
| 10 mg/mL · 10 mg vial + 1 mL | 0.04 mL | 4 units |
| 15 mg/mL · 30 mg vial + 2 mL | 0.02667 mL | 2.667 units |
| 20 mg/mL · 20 mg vial + 1 mL | 0.02 mL | 2 units |
400 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 | 20 units | 40 units | 60 units |
| 5 mg | 8 units | 16 units | 24 units |
| 10 mg | 4 units | 8 units | 12 units |
| 15 mg | 2.667 units | 5.333 units | 8 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 400 mcg?
It depends on the concentration of the vial. At 2.5 mg/mL (5 mg vial + 2 mL) 400 mcg is 16 units on a U-100 insulin syringe. At 5 mg/mL (10 mg vial + 2 mL) it is 8 units.
Why is there no single answer for 400 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 400 mcg?
Divide 0.4 mg by the concentration in mg/mL. At 2.5 mg/mL that is 0.16 mL; at 5 mg/mL it is 0.08 mL.
How many mg is 400 mcg?
400 mcg is 0.4 mg. There are 1,000 mcg in 1 mg.
The same amount written the other way: 0.4 mg to units.
Nearby conversions
- 200 mcg to units
- 250 mcg to units
- 300 mcg to units
- 500 mcg to units
- 600 mcg to units
- 750 mcg to units
- 0.4 mg to units
- 0.5 mg to units
- 80 units to mg
- 40 units to mL
- 0.15 mL to units
- mcg to mg
- All conversions