20 mg vial + 3 mL bacteriostatic water
A 20 mg vial reconstituted with 3 mL comes to 6.667 mg/mL. Every unit on a U-100 insulin syringe then carries 66.67 mcg, so 500 mcg is 7.5 units (0.075 mL) and the vial holds 40 draws of that size.
Units for each amount
| Dose | mL | U-100 units | U-40 units | Doses per vial |
|---|---|---|---|---|
| 50 mcg | 0.0075 | 0.75 | 0.3 | 400 |
| 100 mcg | 0.015 | 1.5 | 0.6 | 200 |
| 150 mcg | 0.023 | 2.3 | 0.9 | 133 |
| 200 mcg | 0.03 | 3 | 1.2 | 100 |
| 250 mcg | 0.038 | 3.8 | 1.5 | 80 |
| 300 mcg | 0.045 | 4.5 | 1.8 | 66 |
| 400 mcg | 0.06 | 6 | 2.4 | 50 |
| 500 mcg | 0.075 | 7.5 | 3 | 40 |
| 750 mcg | 0.11 | 11.2 | 4.5 | 26 |
| 1 mg | 0.15 | 15 | 6 | 20 |
| 1.5 mg | 0.22 | 22.5 | 9 | 13 |
| 2 mg | 0.3 | 30 | 12 | 10 |
| 2.5 mg | 0.38 | 37.5 | 15 | 8 |
| 5 mg | 0.75 | 75 | 30 | 4 |
| 10 mg | 1.5 | 150 | 60 | 2 |
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 = | |
|---|---|---|---|---|
| 0.5 mL | 40 | 400 | 1.3 units | table → |
| 1 mL | 20 | 200 | 2.5 units | table → |
| 1.5 mL | 13.333 | 133.33 | 3.8 units | table → |
| 2 mL | 10 | 100 | 5 units | table → |
| 2.5 mL | 8 | 80 | 6.3 units | table → |
| 3 mL | 6.667 | 66.67 | 7.5 units | |
| 5 mL | 4 | 40 | 12.5 units | table → |
Same concentration, different vial
These pairs also come to 6.667 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 10 mg + 1.5 mL.
Try other numbers
20 mg + 3 mL questions
What concentration is 20 mg in 3 mL?
20 mg divided by 3 mL is 6.667 mg/mL, which is 6,667 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 66.67 mcg.
How many units is 500 mcg from a 20 mg vial with 3 mL?
500 mcg divided by 6,667 mcg/mL is 0.075 mL, which is 7.5 units on a U-100 syringe and 3 units on a U-40 syringe. The vial holds 40 draws of that size.
What if I add 5 mL instead of 3 mL to the 20 mg vial?
The mass stays 20 mg. With 5 mL the concentration is 4 mg/mL instead of 6.667 mg/mL, so the same amount per draw needs more units: 500 mcg becomes 12.5 units instead of 7.5.
Does a 20 mg vial hold 3 mL?
Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 3 mL fits with room to swirl. Check the vial if it is an unusually small format.
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