Reconstitution Calculator
Convert vial amount, bacteriostatic water volume, and desired dose into concentration and injection volume.
This is a mathematical calculator only. It does not constitute medical advice or dosing guidance. Always confirm with a qualified professional.
Concentration
2,500 mcg/mL
Dose
250 mcg
Injection volume
0.100 mL
Insulin units (U-100)
10.0 units
How the math works
Concentration (mcg/mL) = (vial mg × 1000) ÷ BAC water mL. Injection volume (mL) = desired dose mcg ÷ concentration. On a U-100 insulin syringe, units = volume mL × 100.
Example: a 5 mg vial reconstituted with 2 mL of BAC water yields 2,500 mcg/mL. A 250 mcg dose is 0.1 mL, or 10 units on a U-100 syringe.