Bacteriostatic water calculator
To make 5 mg/mL from a 10 mg vial, add 2 mL of bacteriostatic water (10 ÷ 5 = 2).
Calculator
Reference chart
| Vial (mg) | 1 mg/mL | 2 mg/mL | 2.5 mg/mL | 5 mg/mL | 10 mg/mL |
|---|---|---|---|---|---|
| 2 | 2 mL | 1 mL | 0.8 mL | 0.4 mL | 0.2 mL |
| 5 | 5 mL | 2.5 mL | 2 mL | 1 mL | 0.5 mL |
| 10 | 10 mL | 5 mL | 4 mL | 2 mL | 1 mL |
| 15 | 15 mL | 7.5 mL | 6 mL | 3 mL | 1.5 mL |
| 20 | 20 mL | 10 mL | 8 mL | 4 mL | 2 mL |
| 30 | 30 mL | 15 mL | 12 mL | 6 mL | 3 mL |
| 50 | 50 mL | 25 mL | 20 mL | 10 mL | 5 mL |
Worked example
Example: 10 mg vial, target 5 mg/mL → 10 ÷ 5 = 2 mL of water.
How it works
1. Vial content
Note the vial content in mg.
2. Target concentration
Choose the concentration you want in mg/mL.
3. Divide
Water (mL) = vial mg ÷ target mg/mL.
Frequently asked questions
How much bacteriostatic water do I add to a 10 mg vial?
It depends on the concentration you want: 1 mL gives 10 mg/mL, 2 mL gives 5 mg/mL, 3 mL gives about 3.33 mg/mL.
What is bacteriostatic water?
Sterile water with 0.9% benzyl alcohol, a preservative that inhibits bacterial growth so a multi-use vial can be entered more than once.
Bacteriostatic water vs sterile water?
Sterile water has no preservative and is intended for single use. Bacteriostatic water contains benzyl alcohol and is labeled for multiple withdrawals.
Sources
Label and trial dose references
For doses as printed in FDA labels or used in trials, see the peptide dose reference and the protocol pages.
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