How many units from a 12 mg vial with 2 mL of water?
12 mg ÷ 2 mL = 6 mg/mL (6000 mcg/mL). Example inputs on a U-100 syringe: 250 mcg = 4.167 units, 500 mcg = 8.333 units, 1 mg = 16.667 units. Amounts in the table are arbitrary examples for the arithmetic, not suggested draws. More water lowers concentration and gives a larger, easier-to-read draw for the same amount; use reverse mode or the how-much-water pages to pick a water volume.
The math
concentration = 12 mg ÷ 2 mL = 6 mg/mL = 6000 mcg/mL volume (mL) = amount mcg ÷ 6000 units (U-100) = volume mL × 100 Example: 500 mcg ÷ 6000 = 0.083 mL = 8.333 U-100 units
| Example amount | mL | U-100 | U-50 | U-40 |
|---|---|---|---|---|
| 250 mcg | 0.042 | 4.167 | 2.083 | 1.667 |
| 500 mcg | 0.083 | 8.333 | 4.167 | 3.333 |
| 1 mg | 0.167 | 16.667 | 8.333 | 6.667 |
| 2 mg | 0.333 | 33.333 | 16.667 | 13.333 |
| 2.5 mg | 0.417 | 41.667 | 20.833 | 16.667 |
Note: Rows under about 5 U-100 units are hard to read on many barrels; more water increases units for the same amount.
Math only, not medical advice. This page converts numbers; it does not recommend any compound or amount.
Concentration = 12 mg ÷ 2 mL = 6 mg/mL Volume = 500 mcg ÷ 6000 mcg/mL = 0.0833 mL Units = 0.0833 mL × 100 (U-100) = 8.33 units
U-100 syringe · 100-unit barrel. Illustration only; read the marks on your actual syringe.
Math only, not medical advice. Verify every number yourself.