500 mcg to units
500 mcg (0.5 mg) is 10 units on a U-100 insulin syringe when the vial is 5 mg/mL, and 5 units at 10 mg/mL. The answer changes with concentration: units = mg ÷ mg/mL × 100.
500 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 | 500 mcg = |
|---|---|---|
| 1 mg/mL · 5 mg vial + 5 mL | 0.5 mL | 50 units |
| 2 mg/mL · 10 mg vial + 5 mL | 0.25 mL | 25 units |
| 2.5 mg/mL · 5 mg vial + 2 mL | 0.2 mL | 20 units |
| 3 mg/mL · 15 mg vial + 5 mL | 0.1667 mL | 16.67 units |
| 5 mg/mL · 10 mg vial + 2 mL | 0.1 mL | 10 units |
| 7.5 mg/mL · 15 mg vial + 2 mL | 0.06667 mL | 6.667 units |
| 10 mg/mL · 10 mg vial + 1 mL | 0.05 mL | 5 units |
| 15 mg/mL · 30 mg vial + 2 mL | 0.03333 mL | 3.333 units |
| 20 mg/mL · 20 mg vial + 1 mL | 0.025 mL | 2.5 units |
500 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 | 25 units | 50 units | 75 units |
| 5 mg | 10 units | 20 units | 30 units |
| 10 mg | 5 units | 10 units | 15 units |
| 15 mg | 3.333 units | 6.667 units | 10 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 500 mcg?
It depends on the concentration of the vial. At 5 mg/mL (10 mg vial + 2 mL) 500 mcg is 10 units on a U-100 insulin syringe. At 10 mg/mL (10 mg vial + 1 mL) it is 5 units.
Why is there no single answer for 500 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 500 mcg?
Divide 0.5 mg by the concentration in mg/mL. At 5 mg/mL that is 0.1 mL; at 10 mg/mL it is 0.05 mL.
How many mg is 500 mcg?
500 mcg is 0.5 mg. There are 1,000 mcg in 1 mg.
The same amount written the other way: 0.5 mg to units.
Nearby conversions
- 250 mcg to units
- 300 mcg to units
- 400 mcg to units
- 600 mcg to units
- 750 mcg to units
- 1,000 mcg to units
- 0.5 mg to units
- 0.6 mg to units
- 100 units to mg
- 50 units to mL
- 0.2 mL to units
- mcg to mg
- All conversions