30 mg vial + 2.5 mL bacteriostatic water
A 30 mg vial reconstituted with 2.5 mL comes to 12 mg/mL. Every unit on a U-100 insulin syringe then carries 120 mcg, so 500 mcg is 4.2 units (0.042 mL) and the vial holds 60 draws of that size.
Units for each amount
| Dose | mL | U-100 units | U-40 units | Doses per vial |
|---|---|---|---|---|
| 50 mcg | 0.0042 | 0.42 | 0.17 | 600 |
| 100 mcg | 0.0083 | 0.83 | 0.33 | 300 |
| 150 mcg | 0.012 | 1.3 | 0.5 | 200 |
| 200 mcg | 0.017 | 1.7 | 0.67 | 150 |
| 250 mcg | 0.021 | 2.1 | 0.83 | 120 |
| 300 mcg | 0.025 | 2.5 | 1 | 100 |
| 400 mcg | 0.033 | 3.3 | 1.3 | 75 |
| 500 mcg | 0.042 | 4.2 | 1.7 | 60 |
| 750 mcg | 0.063 | 6.3 | 2.5 | 40 |
| 1 mg | 0.083 | 8.3 | 3.3 | 30 |
| 1.5 mg | 0.13 | 12.5 | 5 | 20 |
| 2 mg | 0.17 | 16.7 | 6.7 | 15 |
| 2.5 mg | 0.21 | 20.8 | 8.3 | 12 |
| 5 mg | 0.42 | 41.7 | 16.7 | 6 |
| 10 mg | 0.83 | 83.3 | 33.3 | 3 |
Same vial, other volumes
The mass does not move. Only the concentration and the unit count do.
| Water | mg/mL | mcg per unit | 500 mcg = | |
|---|---|---|---|---|
| 1 mL | 30 | 300 | 1.7 units | table → |
| 1.5 mL | 20 | 200 | 2.5 units | table → |
| 2 mL | 15 | 150 | 3.3 units | table → |
| 2.5 mL | 12 | 120 | 4.2 units | |
| 3 mL | 10 | 100 | 5 units | table → |
| 5 mL | 6 | 60 | 8.3 units | table → |
Same concentration, different vial
These pairs also come to 12 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 60 mg + 5 mL.
Try other numbers
30 mg + 2.5 mL questions
What concentration is 30 mg in 2.5 mL?
30 mg divided by 2.5 mL is 12 mg/mL, which is 12,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 120 mcg.
How many units is 500 mcg from a 30 mg vial with 2.5 mL?
500 mcg divided by 12,000 mcg/mL is 0.042 mL, which is 4.2 units on a U-100 syringe and 1.7 units on a U-40 syringe. The vial holds 60 draws of that size.
What if I add 3 mL instead of 2.5 mL to the 30 mg vial?
The mass stays 30 mg. With 3 mL the concentration is 10 mg/mL instead of 12 mg/mL, so the same amount per draw needs more units: 500 mcg becomes 5 units instead of 4.2.
Does a 30 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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