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How many units is 250 mcg from a 5 mg vial with 3 mL of water?

5 mg ÷ 3 mL = 1.667 mg/mL (1666.667 mcg/mL). 250 mcg ÷ 1666.667 mcg/mL = 0.15 mL. On a U-100 syringe that is 15 units (U-50: 7.5, U-40: 6). The vial holds 20 draws of that size.

The math

Concentration = 5 mg ÷ 3 mL = 1.667 mg/mL
Volume = 250 mcg ÷ 1666.667 mcg/mL = 0.15 mL
Units (U-100) = 0.15 × 100 = 15

Math only, not medical advice. This page converts numbers; it does not recommend any compound or amount.

Draw to
15 units
= 0.15 mL · concentration 1.667 mg/mL (1666.7 mcg/mL) · 20 draws per vial
Concentration = 5 mg ÷ 3 mL = 1.6667 mg/mL
Volume = 250 mcg ÷ 1666.67 mcg/mL = 0.15 mL
Units = 0.15 mL × 100 (U-100) = 15 units
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Math only, not medical advice. Verify every number yourself.

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