Free tool

Reconstitution calculator

Converts a vial strength and the volume of water added into the mark on an insulin syringe. It is arithmetic, not advice: it does not know what you were prescribed and it will never suggest a dose.

What is in front of you

Vial strength mg The number printed on the vial, before anything is added to it. Water added mL The volume of bacteriostatic water you put in. Dose you were prescribed From your prescriber. Check the unit on the label: 1 mg is 1,000 mcg. This tool does not know your dose and will not suggest one. Syringe size

Draw to

not set

Concentration
Barrel: units

That dose is larger than this syringe holds at this concentration. Check the numbers against what your prescriber told you.

Is that dose in micrograms? 1 mg is 1,000 mcg, and a dose this far over the barrel is usually a mcg figure entered as mg. Check the label.

strength ÷ water = concentration · dose ÷ concentration = mL · mL × 100 = units. A dose entered in mcg is divided by 1,000 first. An insulin syringe is marked in units, and 100 units is 1 mL on every barrel size.

What this is and is not. It divides a vial strength by a volume and converts the result to syringe units. It does not store anything, nothing is sent to us, and it is not medical advice. It is not a substitute for the instructions your prescriber gave you, and it does not tell you whether a compound is approved. That is on the reference pages.