Tool

Reconstitution calculator

Put in the strength of the vial, how much bacteriostatic water you added, and the dose you want. It works out how far to draw the syringe, and draws the fill line for you. It updates as you type — there is no button to press.

Draw to — units on the syringe

Draw volume—

Concentration—

Doses / vial—

Fill to the green line — U-100 insulin syringe

How the math works

Concentration = vial strength ÷ water added. Draw volume = (dose ÷ 1000) ÷ concentration. Units = draw volume × the syringe's units-per-mL. Nothing is rounded until it's shown to you, so the numbers stay accurate. New to any of these terms? The glossary defines each one.

Educational tool only. Double-check every result before relying on it. For laboratory research use only — not medical advice.