VialBPC-157 Reconstitution Calculator
5 mg and 10 mg BPC-157 vials, bacteriostatic water, insulin syringes — the concentration math and the exact draw, with a visual fill line. Free, no account, nothing you type leaves your browser. Unit conversion only. Not medical guidance.
The fastest way: pick a common setup below — it opens the full calculator pre-filled. Or open the general reconstitution calculator and enter your own numbers.
| Vial | BAC water | Concentration | Common referenced amount | Open pre-filled |
|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 250 mcg → 0.05 mL (5 units, U-100) | Calculate → |
| 5 mg | 1 mL | 5 mg/mL | 500 mcg → 0.10 mL (10 units, U-100) | Calculate → |
| 5 mg | 2 mL | 2.5 mg/mL | 250 mcg → 0.10 mL (10 units, U-100) | Calculate → |
| 10 mg | 1 mL | 10 mg/mL | 250 mcg → 0.025 mL (2.5 units, U-100) | Calculate → |
| 10 mg | 2 mL | 5 mg/mL | 500 mcg → 0.10 mL (10 units, U-100) | Calculate → |
| 10 mg | 3 mL | 3.33 mg/mL | 250 mcg → 0.075 mL (7.5 units, U-100) | Calculate → |
The BPC-157 math, in two lines
concentration = vial strength ÷ diluent volume
draw volume = target amount ÷ concentration
Example: a 5 mg vial mixed with 1 mL of bacteriostatic water gives 5 mg/mL. A referenced 0.25 mg (250 mcg) amount then needs 0.25 ÷ 5 = 0.05 mL — which reads as 5 units on a 100U insulin syringe. Smaller amounts draw more comfortably from a more dilute mix: the same 5 mg vial with 2 mL gives 2.5 mg/mL, and 0.25 mg becomes a 10-unit draw.
Why the diluent volume matters so much
- Small draws are hard to read. Below ~0.03 mL (3 units on U-100), measuring error grows. Adding more diluent makes each draw larger and easier to measure.
- Concentration changes, the vial doesn't. Whether you add 1 mL or 3 mL, the vial still holds the same total amount — only the map from syringe units to amount changes.
- Use BAC water, not sterile water, for multi-use vials. The 0.9% benzyl alcohol is what makes a punctured vial safe to re-puncture for weeks — see our diluent guide.
- No silent rounding. The calculator shows the exact draw to 4 decimals and blocks any target that exceeds the vial contents.
Handling notes
- Refrigerate after mixing and keep the vial out of direct light.
- Track the 28-day window from first puncture — many multi-use vials carry this in-use limit (the 28-day rule, explained).
- Gentle mixing. Swirl or roll the vial; don't shake peptide solutions into foam.
FAQ
- How much bacteriostatic water for a 5 mg BPC-157 vial?
- Depends on the concentration you want: 1 mL gives 5 mg/mL, 2 mL gives 2.5 mg/mL. At 5 mg/mL, a 250 mcg amount is a 5-unit draw on a U-100 syringe — the table above has the common setups.
- How many units is 250 mcg of BPC-157?
- At 5 mg/mL, 0.05 mL = 5 units (U-100). At 2.5 mg/mL, 0.10 mL = 10 units. The answer always depends on your diluent volume — that's what the calculator is for.
- How long does reconstituted BPC-157 last?
- Many multi-use vials carry a 28-day in-use window after first puncture. Refrigerate, and see our 28-day vial rule guide.
- Does this calculator need an account?
- No — free and unlimited, no email, no paywall. The math runs entirely in your browser.
- Does it tell me how much to take?
- No. Unit conversion only, on numbers you enter. Dosing decisions belong to you and a licensed healthcare professional.
Related
The calculator, plus a dose log, smart site rotation, vial inventory and reminders — private by design.