15 mg to units
15 mg is 100 units on a U-100 insulin syringe when the vial is 15 mg/mL, and 75 units at 20 mg/mL. The answer changes with concentration: units = mg ÷ mg/mL × 100.
15 mg 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 | 15 mg = |
|---|---|---|
| 1 mg/mL · 5 mg vial + 5 mL | 15 mL | 1,500 units · over 1 mL |
| 2 mg/mL · 10 mg vial + 5 mL | 7.5 mL | 750 units · over 1 mL |
| 2.5 mg/mL · 5 mg vial + 2 mL | 6 mL | 600 units · over 1 mL |
| 3 mg/mL · 15 mg vial + 5 mL | 5 mL | 500 units · over 1 mL |
| 5 mg/mL · 10 mg vial + 2 mL | 3 mL | 300 units · over 1 mL |
| 7.5 mg/mL · 15 mg vial + 2 mL | 2 mL | 200 units · over 1 mL |
| 10 mg/mL · 10 mg vial + 1 mL | 1.5 mL | 150 units · over 1 mL |
| 15 mg/mL · 30 mg vial + 2 mL | 1 mL | 100 units |
| 20 mg/mL · 20 mg vial + 1 mL | 0.75 mL | 75 units |
15 mg 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 |
|---|---|---|---|
| 15 mg | 100 units | 200 units · over 1 mL | 300 units · over 1 mL |
| 20 mg | 75 units | 150 units · over 1 mL | 225 units · over 1 mL |
| 30 mg | 50 units | 100 units | 150 units · over 1 mL |
| 60 mg | 25 units | 50 units | 75 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 15 mg?
It depends on the concentration of the vial. At 15 mg/mL (30 mg vial + 2 mL) 15 mg is 100 units on a U-100 insulin syringe. At 20 mg/mL (20 mg vial + 1 mL) it is 75 units.
Why is there no single answer for 15 mg 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 15 mg?
Divide 15 mg by the concentration in mg/mL. At 15 mg/mL that is 1 mL; at 20 mg/mL it is 0.75 mL.
How many mcg is 15 mg?
15 mg is 15,000 mcg. There are 1,000 mcg in 1 mg.
What if 15 mg comes to more than 100 units?
A 1 mL U-100 syringe stops at 100 units. At 1, 2, 2.5, 3, 5, 7.5 and 10 mg/mL, 15 mg is more than 1 mL, so it does not fit in one draw. A stronger mix (less water in the same vial) makes the same amount a smaller volume.
Nearby conversions
- 7.5 mg to units
- 8 mg to units
- 9 mg to units
- 10 mg to units
- 12 mg to units
- 12.5 mg to units
- 750 mcg to units
- 1,000 mcg to units
- 25 units to mg
- 2 units to mL
- 0.3 mL to units
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