How many units is 100 mcg from a 5 mg vial with 2 mL of water?
5 mg ÷ 2 mL = 2.5 mg/mL (2500 mcg/mL). 100 mcg ÷ 2500 mcg/mL = 0.04 mL. On a U-100 syringe that is 4 units (U-50: 2, U-40: 1.6). The vial holds 50 draws of that size.
The math
Concentration = 5 mg ÷ 2 mL = 2.5 mg/mL Volume = 100 mcg ÷ 2500 mcg/mL = 0.04 mL Units (U-100) = 0.04 × 100 = 4
Math only, not medical advice. This page converts numbers; it does not recommend any compound or amount.
Draw to
4 units
= 0.04 mL · concentration 2.5 mg/mL (2500 mcg/mL) · 50 draws per vial
⚠ Under 5 units is hard to measure accurately. Even 3 mL of water only gets this amount to 6 units, so no reasonable volume reaches 10. A smaller syringe (0.3 mL / 30 units) has finer, more readable marks.
Concentration = 5 mg ÷ 2 mL = 2.5 mg/mL Volume = 100 mcg ÷ 2500 mcg/mL = 0.04 mL Units = 0.04 mL × 100 (U-100) = 4 units
Math only, not medical advice. Verify every number yourself.
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