20 mg vial + 5 mL bacteriostatic water
A 20 mg vial reconstituted with 5 mL comes to 4 mg/mL. Every unit on a U-100 insulin syringe then carries 40 mcg, so 500 mcg is 12.5 units (0.13 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 | 0.013 | 1.3 | 0.5 | 400 |
| 100 mcg | 0.025 | 2.5 | 1 | 200 |
| 150 mcg | 0.038 | 3.8 | 1.5 | 133 |
| 200 mcg | 0.05 | 5 | 2 | 100 |
| 250 mcg | 0.063 | 6.3 | 2.5 | 80 |
| 300 mcg | 0.075 | 7.5 | 3 | 66 |
| 400 mcg | 0.1 | 10 | 4 | 50 |
| 500 mcg | 0.13 | 12.5 | 5 | 40 |
| 750 mcg | 0.19 | 18.8 | 7.5 | 26 |
| 1 mg | 0.25 | 25 | 10 | 20 |
| 1.5 mg | 0.38 | 37.5 | 15 | 13 |
| 2 mg | 0.5 | 50 | 20 | 10 |
| 2.5 mg | 0.63 | 62.5 | 25 | 8 |
| 5 mg | 1.25 | 125 | 50 | 4 |
| 10 mg | 2.5 | 250 | 100 | 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 | table → |
| 5 mL | 4 | 40 | 12.5 units |
Same concentration, different vial
These pairs also come to 4 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 2 mg + 0.5 mL, 10 mg + 2.5 mL.
Try other numbers
20 mg + 5 mL questions
What concentration is 20 mg in 5 mL?
20 mg divided by 5 mL is 4 mg/mL, which is 4,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 40 mcg.
How many units is 500 mcg from a 20 mg vial with 5 mL?
500 mcg divided by 4,000 mcg/mL is 0.13 mL, which is 12.5 units on a U-100 syringe and 5 units on a U-40 syringe. The vial holds 40 draws of that size.
What if I add 0.5 mL instead of 5 mL to the 20 mg vial?
The mass stays 20 mg. With 0.5 mL the concentration is 40 mg/mL instead of 4 mg/mL, so the same amount per draw needs fewer units: 500 mcg becomes 1.3 units instead of 12.5.
Does a 20 mg vial hold 5 mL?
Not always. Many lyophilized peptide vials are 2 mL or 3 mL glass; 5 mL will not fit in those. Check the vial before choosing this volume, or split the mass across two vials.
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