Bacteriostatic Water Calculator
See how different water volumes change concentration in educational reconstitution calculations.
What is the total volume of your syringe?
Select Peptide Vial Quantity
How much bacteriostatic water are you adding?
How much of the Peptide do you want in each dose?
To have a dose of 50 mcg pull the syringe to 0.33
Water volume and concentration
Adding more liquid lowers concentration per mL; adding less liquid raises concentration per mL. The vial amount remains the same, but the amount in each mL changes.
This page explains math only and does not provide instructions for preparing, storing, or using injectable products.
Compare 1 mL, 2 mL, and 3 mL mathematically
For a hypothetical 10 mg vial, 1 mL gives 10,000 mcg/mL, 2 mL gives 5,000 mcg/mL, and 3 mL gives approximately 3,333.33 mcg/mL. A selected 500 mcg amount corresponds to 0.05 mL, 0.1 mL, and 0.15 mL respectively: 5, 10, and 15 U-100 units.
These comparisons show the effect of volume, not which volume to choose. The input should come from the applicable product instructions or professional guidance. The calculation assumes entered water volume equals final solution volume.
Use with professional guidance
Bacteriostatic water and injectable products involve safety considerations outside this calculator, including sterility and appropriate use.
Consult a licensed healthcare professional or pharmacist before using any medication or injectable product.
Common calculation examples
| Vial amount | Water added | Concentration | Selected amount | mL result | U-100 units |
|---|---|---|---|---|---|
| 5 mg | 1 mL | 5000 mcg/mL | 250 mcg | 0.05 mL | 5 units |
| 5 mg | 2 mL | 2500 mcg/mL | 250 mcg | 0.1 mL | 10 units |
| 10 mg | 2 mL | 5000 mcg/mL | 500 mcg | 0.1 mL | 10 units |
| 10 mg | 3 mL | 3333 mcg/mL | 500 mcg | 0.15 mL | 15 units |
| 15 mg | 3 mL | 5000 mcg/mL | 1000 mcg | 0.2 mL | 20 units |
Frequently asked questions
Does this calculator choose how much water to add?
No. You enter the volume, and it calculates the resulting concentration. It cannot determine a product's appropriate diluent, solubility, or preparation instructions.
What happens to concentration when volume doubles?
With the same total mass, concentration halves. The volume corresponding to the same selected mass therefore doubles.
Does the water volume change the total peptide mass?
The arithmetic model keeps vial mass constant. It does not model product loss, degradation, or incomplete dissolution.