Free Online Tool
Peptide Reconstitution Calculator
Calculate the exact volume to draw from your syringe after reconstituting a peptide vial with bacteriostatic water. Enter your vial content, BAC water volume, and target dose below.
Volume to Draw
0.100 ml
Concentration
2.50 mg/ml
Your Dose
0.25 mg
How Peptide Reconstitution Works
When you receive a lyophilized peptide vial, the peptide is in powder form. To prepare it for injection, you add bacteriostatic (BAC) water to dissolve the powder — this process is called reconstitution.
The key calculation is straightforward: Volume to Draw = (Target Dose × BAC Water) ÷ Vial Content. For example, if you have a 5 mg vial reconstituted with 2 ml of BAC water and want a 250 mcg (0.25 mg) dose, the draw-up volume is (0.25 × 2) ÷ 5 = 0.10 ml.
Our calculator handles all unit conversions automatically. It also recommends the appropriate syringe size and shows you exactly where to draw on the barrel.
Frequently Asked Questions
- What is peptide reconstitution?
- Reconstitution is the process of adding bacteriostatic (BAC) water to a lyophilized (freeze-dried) peptide powder to create an injectable solution. The amount of water you add determines the concentration of the solution.
- How much BAC water should I use?
- The amount of BAC water depends on the vial content and your desired concentration. Common volumes are 1-3 ml for most peptide vials. More water means a lower concentration and larger injection volumes, while less water means higher concentration and smaller volumes.
- How do I read my syringe after reconstitution?
- After calculating the draw-up volume, use an insulin syringe (typically 1 ml / 100 units). Each small tick on a 1 ml syringe represents 0.01 ml (1 unit). For example, 0.10 ml = 10 units on the syringe.
- What is the difference between mg, mcg, and IU?
- mg (milligrams) and mcg (micrograms) are weight-based units — 1 mg = 1,000 mcg. IU (International Units) is a measurement of biological activity, not weight, and varies by substance. For example, 1 IU of HGH ≈ 0.33 mg, while 1 IU of HCG is a much smaller amount.
- Can I use this calculator for HGH, BPC-157, or HCG?
- Yes. This calculator works for any peptide or reconstituted compound. Simply enter the vial content (e.g., 5 mg BPC-157, 5000 IU HCG, or 10 IU HGH), the amount of BAC water, and your target dose.
Want to see how your serum levels build up over time?
Try the Serum Level Visualizer →