Reconstitution calculator
Enter the vial mass, the volume of bacteriostatic water added, and the amount you want to draw. The tool returns the resulting concentration and the syringe graduation.
Concentration
5.00 mg/ml
5,000 mcg per ml
Draw volume
0.050 ml
of reconstituted solution
Syringe units
5.0 units
on a U-100 scale (1 unit = 0.01 ml)
That vial contains approximately 40 draws of this size.
Arithmetic reference for laboratory handling only. This tool converts mass and volume; it does not suggest what quantity is appropriate for anything, and the compounds discussed are in-vitro research materials.
What reconstitution maths actually describes
Lyophilised research peptides arrive as a dried powder of a stated mass. Reconstitution is simply dissolving that mass into a measured volume of bacteriostatic water so the resulting solution has a known concentration — mass divided by volume. A 10 mg vial brought up in 2 mL of diluent gives 5 mg/mL; the same vial in 5 mL gives 2 mg/mL.
Insulin-style syringes are graduated in units rather than millilitres, which is where most arithmetic errors creep in. A standard U-100 syringe marks 100 units across 1 mL, so each unit is 0.01 mL. Converting between a target volume and syringe graduations is the only thing a reconstitution calculator does — it does not tell you what quantity is appropriate for any protocol, and no calculator should be read as guidance for human use.
Concentration also interacts with stability. More concentrated solutions occupy less volume in cold storage, but every extra withdrawal from a vial adds a handling event. Our storage and handling guide covers refrigerated and frozen shelf-life considerations reported in the literature.
Educational content only. Nothing here is medical advice, and the compounds discussed are laboratory research materials, not treatments.