3 mg vial + 2.5 mL bacteriostatic water
A 3 mg vial reconstituted with 2.5 mL comes to 1.2 mg/mL. Every unit on a U-100 insulin syringe then carries 12 mcg, so 250 mcg is 20.8 units (0.21 mL) and the vial holds 12 draws of that size.
Units for each amount
| Dose | mL | U-100 units | U-40 units | Doses per vial |
|---|---|---|---|---|
| 50 mcg | 0.042 | 4.2 | 1.7 | 60 |
| 100 mcg | 0.083 | 8.3 | 3.3 | 30 |
| 150 mcg | 0.13 | 12.5 | 5 | 20 |
| 200 mcg | 0.17 | 16.7 | 6.7 | 15 |
| 250 mcg | 0.21 | 20.8 | 8.3 | 12 |
| 300 mcg | 0.25 | 25 | 10 | 10 |
| 400 mcg | 0.33 | 33.3 | 13.3 | 7 |
| 500 mcg | 0.42 | 41.7 | 16.7 | 6 |
| 750 mcg | 0.63 | 62.5 | 25 | 4 |
| 1 mg | 0.83 | 83.3 | 33.3 | 3 |
| 1.5 mg | 1.25 | 125 | 50 | 2 |
| 2 mg | 1.67 | 166.7 | 66.7 | 1 |
| 2.5 mg | 2.08 | 208.3 | 83.3 | 1 |
Same vial, other volumes
The mass does not move. Only the concentration and the unit count do.
| Water | mg/mL | mcg per unit | 250 mcg = | |
|---|---|---|---|---|
| 0.5 mL | 6 | 60 | 4.2 units | table → |
| 1 mL | 3 | 30 | 8.3 units | table → |
| 1.5 mL | 2 | 20 | 12.5 units | table → |
| 2 mL | 1.5 | 15 | 16.7 units | table → |
| 2.5 mL | 1.2 | 12 | 20.8 units | |
| 3 mL | 1 | 10 | 25 units | table → |
| 5 mL | 0.6 | 6 | 41.7 units | table → |
Try other numbers
3 mg + 2.5 mL questions
What concentration is 3 mg in 2.5 mL?
3 mg divided by 2.5 mL is 1.2 mg/mL, which is 1,200 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 12 mcg.
How many units is 250 mcg from a 3 mg vial with 2.5 mL?
250 mcg divided by 1,200 mcg/mL is 0.21 mL, which is 20.8 units on a U-100 syringe and 8.3 units on a U-40 syringe. The vial holds 12 draws of that size.
What if I add 3 mL instead of 2.5 mL to the 3 mg vial?
The mass stays 3 mg. With 3 mL the concentration is 1 mg/mL instead of 1.2 mg/mL, so the same amount per draw needs more units: 250 mcg becomes 25 units instead of 20.8.
Does a 3 mg vial hold 2.5 mL?
Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 2.5 mL fits with room to swirl. Check the vial if it is an unusually small format.
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