How to Use the Peptide Calculator
- Enter your peptide vial size in milligrams (e.g., 5mg, 10mg).
- Enter the volume of bacteriostatic (BAC) water you will add in milliliters (e.g., 2ml).
- Enter your desired dose in micrograms (mcg).
- Select your syringe size (100 units = 1ml, 50 units = 0.5ml, or 30 units = 0.3ml).
- Read the result: the peptide calculator shows exactly how many units to draw for your dose.
Understanding Peptide Dosage & BAC Water Ratio
This peptide calculator uses a simple formula: Concentration (mcg per unit) = (Peptide mg × 1000) ÷ (BAC Water ml × 100). One milliliter equals 100 insulin units.
Example: 5mg peptide in 2ml BAC water = 5000mcg ÷ 200 units = 25 mcg/unit. For 250mcg, pull 10 units.
More BAC water = lower concentration = more units per dose. Less BAC water = higher concentration = fewer units.
Peptide Calculator Chart
| Peptide | BAC Water | Concentration | 250mcg = | 500mcg = |
|---|---|---|---|---|
| 5mg | 2ml | 25 mcg/unit | 10 units | 20 units |
| 5mg | 2.5ml | 20 mcg/unit | 12.5 units | 25 units |
| 10mg | 2ml | 50 mcg/unit | 5 units | 10 units |
| 10mg | 5ml | 20 mcg/unit | 12.5 units | 25 units |
| 2mg | 1ml | 20 mcg/unit | 12.5 units | 25 units |
Storage and Safety Tips
Reconstituted peptides should be refrigerated (2–8°C / 36–46°F). Avoid freezing.
BAC water typically has a 28–30 day shelf life after opening. Check the manufacturer label.
Keep vials away from light. Use within the recommended timeframe for your peptide.
Frequently Asked Questions
- Why use a peptide calculator?
- A peptide calculator ensures accurate dosing by converting mcg to syringe units. This free tool handles reconstitution math instantly—no spreadsheets or manual errors.
- How do I calculate 250mcg of BPC-157?
- Enter your vial size (e.g., 5mg), BAC water volume (e.g., 2ml), and 250 as the desired dose. The peptide calculator shows the exact units to pull. For 5mg in 2ml, 250mcg = 10 units.
- What is the best BAC water ratio?
- Common ratios are 2–3ml per 5mg vial. More water gives lower concentration and easier dosing; less water gives higher concentration. The peptide calculator compares ratios for your syringe size and dose.
- How many units are in a 1ml syringe?
- A 1ml (100 unit) insulin syringe has 100 units. A 0.5ml syringe has 50 units, and a 0.3ml syringe has 30 units. This tool supports all standard syringe sizes.
- Is this peptide calculator accurate for all peptides?
- Yes. The peptide calculator formula applies to any peptide: concentration = total mcg ÷ total units. It works for BPC-157, Tirzepatide, Semaglutide, Retatrutide, and others.