How do I convert mg to units on an insulin syringe?

Units = dose mg ÷ (mg in the vial ÷ mL of water) × 100 on a U-100 syringe.

How many units are in 1 mL?

A U-100 syringe holds 100 units in 1 mL, so 0.1 mL is 10 units.

Units calculator

mg to units on a U-100 syringe

Units = your dose in mg ÷ (mg in the vial ÷ mL of water) × 100. A 10 mg vial with 2 mL of water is 5 mg per mL, so 2.5 mg is 0.5 mL, which is 50 units.

Pick an amount

0.25 mg 0.5 mg 1 mg 2 mg 2.5 mg 5 mg 7.5 mg 10 mg 12.5 mg 15 mg

Any other numbers? The free dose calculator does it for your exact vial and water.

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This is math only, not medical advice, and never a dose recommendation. Use the dose your prescriber gave you and check the syringe before every shot. A U-100 syringe holds 100 units in 1 mL; 0.5 mL and 0.3 mL syringes hold 50 and 30 units.

Sources

This page only does the math. The FDA has warned that confusion between milliliters, milligrams and units can lead to dosing errors, so check your syringe markings too.

FDA alert: dosing errors with compounded injectable products