BAC Water Calculator
Enter your vial size and target dose. The calculator recommends how much bacteriostatic water to add so your syringe draws are precise and practical.
How many milligrams are in your peptide vial?
What dose do you want per injection?
Select your vial size and dose above to get a water recommendation.
How BAC water reconstitution works
The water volume is the one variable you control. It does not change your dose. It changes how easy that dose is to measure.
Powder meets water
Your peptide arrives as lyophilized (freeze-dried) powder. Adding BAC water dissolves it into an injectable solution. The amount of water you choose sets the concentration.
Concentration determines draw volume
Less water = higher concentration = fewer syringe units per dose. More water = lower concentration = more units per dose. Neither changes the actual dose in micrograms.
Precision is the goal
You want your dose to land in a range that is easy to measure on your syringe. Drawing 2 units is hard to read accurately. Drawing 10-20 units is straightforward. This calculator finds the water volume that hits that sweet spot.
BAC water shelf life and storage
The benzyl alcohol in BAC water is what makes multi-dose vials possible. Without it, you would need to use the entire vial in a single session.
Unopened BAC water
Room temperature is fine. Check the expiration date on the vial. Most manufacturers give it 2-3 years from production.
After reconstitution
Refrigerate at 2-8 degrees C. Stable for approximately 28 days. Keep the vial upright, protected from light. Discard after 30 days regardless of remaining volume.
Sterile water is the exception. It has no preservative, so reconstituted peptides must be used within 24 hours. Only use sterile water if you plan to use the full vial in one session.
Concentration reference
Quick lookup for resulting concentration (mg/ml) based on your vial size and water volume. Higher concentration means fewer units per dose.
| Vial | 1 ml | 2 ml | 2.5 ml | 5 ml |
|---|---|---|---|---|
| 2 mg | 2.00 | 1.00 | 0.80 | 0.40 |
| 3 mg | 3.00 | 1.50 | 1.20 | 0.60 |
| 5 mg | 5.00 | 2.50 | 2.00 | 1.00 |
| 10 mg | 10.00 | 5.00 | 4.00 | 2.00 |
| 15 mg | 15.00 | 7.50 | 6.00 | 3.00 |
All values in mg/ml. To convert your dose: units = (dose in mcg) / (concentration x 1,000) x 100.
Common questions
BAC water volume, storage, and how it relates to your dose.