How many units is 1 mg?
There is no single answer: it depends on concentration. Units (U-100) = 1 mg ÷ concentration (mg/mL) × 100. At 2.5 mg/mL (5 mg in 2 mL) 1 mg = 0.4 mL = 40 units; at 5 mg/mL (5 mg in 1 mL) it is 20 units; at 1 mg/mL it is 100 units. See the table.
The math
units (U-100) = (1 mg ÷ concentration mg/mL) × 100 concentration = vial mg ÷ water mL Example: 1 ÷ 2.5 × 100 = 40 units
| Vial + water | mg/mL | mL for 1 mg | U-100 | U-50 | U-40 |
|---|---|---|---|---|---|
| 5 mg + 5 mL | 1 | 1 | 100 | 50 | 40 |
| 5 mg + 2.5 mL | 2 | 0.5 | 50 | 25 | 20 |
| 5 mg + 2 mL | 2.5 | 0.4 | 40 | 20 | 16 |
| 10 mg + 3 mL | 3.333 | 0.3 | 30 | 15 | 12 |
| 5 mg + 1 mL | 5 | 0.2 | 20 | 10 | 8 |
| 10 mg + 1 mL | 10 | 0.1 | 10 | 5 | 4 |
Math only, not medical advice. This page converts numbers; it does not recommend any compound or amount.
Draw to
10 units
= 0.1 mL · concentration 2.5 mg/mL (2500 mcg/mL) · 20 draws per vial
Concentration = 5 mg ÷ 2 mL = 2.5 mg/mL Volume = 250 mcg ÷ 2500 mcg/mL = 0.1 mL Units = 0.1 mL × 100 (U-100) = 10 units
Math only, not medical advice. Verify every number yourself.