Arithmetic on your numbers. Nothing more.

Safe Tools

A reconstitution calculator that converts vial contents, solvent volume, and a dose you enter into concentration, draw volume, and syringe units — with every formula printed beside the result.

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Reference only Every output is plain arithmetic over the numbers you type. Nothing you enter is stored or sent anywhere.

Reconstitution calculator

Reference only

Research reference only. This tool does arithmetic on the numbers you enter — nothing more.

Concentration: —
Volume per draw: —
Syringe units per draw: —
Draws per vial: —

Formulas used

concentration (mg/mL) = vial contents (mg) ÷ solvent volume (mL)
volume per draw (mL) = dose (mg) ÷ concentration (mg/mL)
syringe units = volume per draw (mL) × 100 (U-100) or × 40 (U-40)
draws per vial = vial contents (mg) ÷ dose (mg)

This calculator does not suggest, check, or endorse any dose or protocol. It converts the figures you type using the formulas shown above, for research reference only.

How this is calculated

Worked example

A 10 mg vial with 2 mL of bacteriostatic water gives 10 ÷ 2 = 5 mg/mL. A 0.25 mg draw is 0.25 ÷ 5 = 0.05 mL, which reads 5 units on a U-100 insulin syringe (0.05 × 100). The same vial holds 10 ÷ 0.25 = 40 such draws.