Laboratory Tools
Peptide Reconstitution Calculator
Quick answer
Reconstitution concentration equals the vial's mass divided by the volume of bacteriostatic water you add. Enter a vial mass and solvent volume below to get mg/mL and mcg/mL instantly. This is laboratory bench math, not a dosing guide.
This is laboratory preparation math: concentration = mass ÷ solvent volume. All figures are volume measurements for handling a reconstituted research sample, not amounts to administer and not a dosing recommendation. For research use only. Not for human consumption, diagnostic, or therapeutic use.
The only formula you need
Reconstitution math reduces to one relationship: concentration = mass ÷ solvent volume. Add a known volume of bacteriostatic water to the vial's labeled mass, and the resulting concentration is fixed by that ratio. The calculator above just evaluates it for you and converts the concentration into the volume that contains a given amount.
Everything is a measurement of concentration and volume for a research sample. No figure here is an amount to administer, and nothing on this page is a dosing recommendation.
Preparing the vial
Let both the lyophilized vial and the bacteriostatic water reach room temperature and wipe both stoppers with alcohol. Draw the chosen solvent volume and let it run slowly down the inner wall of the vial rather than directly onto the powder pellet, because peptides are shear-sensitive.
Do not shake. Swirl gently or leave the vial to stand until fully dissolved and clear. Record the mass, solvent volume, resulting concentration, and date on the vial so downstream measurements trace back to a known preparation.
Questions, answered
How do you calculate peptide reconstitution concentration?
Divide the vial’s labeled mass by the volume of bacteriostatic water you add: concentration = mass ÷ solvent volume. For example, a 10 mg vial reconstituted with 2 mL of bacteriostatic water gives 5 mg/mL (5000 mcg/mL). This is laboratory bench math for a research sample, not a dosing figure.
What solvent is used to reconstitute research peptides?
Bacteriostatic water for injection (sterile water with ~0.9% benzyl alcohol) is the standard laboratory reconstitution solvent, because its preservative lets a vial be sampled over a working window.
How much bacteriostatic water should I add to a peptide vial?
Any volume works; it only sets the concentration. More solvent gives a lower concentration, less gives a higher one. Choose a volume that produces a concentration convenient for your measurement equipment. Enter different volumes above to compare.
Is this reconstitution calculator a dosing tool?
No. It performs laboratory preparation math (mass ÷ volume = concentration) and volume conversions only. Nothing here is a dosing recommendation. For research use only; not for human consumption.