Peptide Reconstitution Calculator
Calculate the exact volume to draw based on vial concentration, reconstitution volume, and desired dose. Built for research planning, not medical instruction.
Lyophilized peptide mass
Bacteriostatic water volume
Per-injection dose
Enter values above or select a preset to calculate your dosage. All values are for educational and research planning only.
What Is Peptide Reconstitution?
Most research peptides arrive as a freeze-dried powder inside a sealed vial. Before the peptide can be measured accurately, it must be dissolved in a liquid solvent — usually bacteriostatic water. Reconstitution simply means mixing the powder with the correct volume of solvent so you can draw a precise dose.
The amount of water you add determines the concentration of the solution. More water dilutes the peptide; less water makes it more concentrated. This calculator translates those raw values into the only thing that matters for dosing: how much liquid to draw into the syringe.
Typical Reconstitution Volumes
These are common starting points used in research settings. The right volume depends on vial mass, desired dose, and syringe precision.
| Vial Mass | BAC Water | Concentration | Easy Round Units |
|---|---|---|---|
| 5 mg | 2 ml | 2,500 mcg/ml | 10 units = 250 mcg |
| 5 mg | 1 ml | 5,000 mcg/ml | 5 units = 250 mcg |
| 10 mg | 2 ml | 5,000 mcg/ml | 10 units = 500 mcg |
| 10 mg | 1 ml | 10,000 mcg/ml | 5 units = 500 mcg |
| 2 mg | 2 ml | 1,000 mcg/ml | 10 units = 100 mcg |
Frequently Asked Questions
What is bacteriostatic water and why use it?▼
Bacteriostatic water is sterile water with 0.9% benzyl alcohol. The benzyl alcohol inhibits bacterial growth, which is why it is preferred for multi-dose vials that will be opened more than once.
Can I use plain sterile water instead?▼
Plain sterile water can be used for single-dose reconstitution, but it lacks a preservative. For vials that will be accessed multiple times, bacteriostatic water is the standard in research settings.
How long is a reconstituted peptide stable?▼
Stability varies by peptide and storage conditions. Most reconstituted peptides are refrigerated at 2–8°C and protected from light. Always follow the storage guidance for the specific compound.
What is a U-100 insulin syringe?▼
A U-100 insulin syringe is calibrated so that 100 units = 1 ml. Each unit equals 0.01 ml, which makes it easy to convert draw volume into syringe units for small peptide doses.
Does more BAC water change the dose?▼
No. The total amount of peptide in the vial does not change. More water just dilutes the solution, so you draw more liquid to get the same dose. The calculator handles the math for either volume.
Can this calculator tell me which peptide to use?▼
No. This tool only calculates volume and concentration from the values you provide. It does not recommend compounds, protocols, or doses. Those decisions belong to a qualified healthcare professional.