Peptide Dosage & Reconstitution Calculator
Enter your vial strength, bacteriostatic water, and target dose — get the exact draw volume, the mark to hit on an insulin syringe, and how many doses your vial holds. It updates live as you type.
Reconstitution & dose calculator
Load a peptide to auto-fill its vial strength, recommended BAC water and documented starting dose — or type your own numbers.
How the calculation works
Three tiny formulas — the calculator just does them instantly for you.
How much peptide sits in every millilitre once reconstituted.
vial strength ÷ BAC waterThe amount of liquid to pull to hit your target dose.
target dose ÷ concentrationThe mark to stop at on a U-100 insulin syringe (100 units = 1 mL).
draw volume × 100Using the calculator
Vial strength
Enter the total peptide in the vial (mg or mcg) — it's printed on the label.
BAC water
Enter how much bacteriostatic water you'll add. More water = larger, easier-to-measure draws.
Target dose
Enter the dose you want per injection. Not sure? Load a peptide to prefill a documented starting dose.
Read & draw
Watch the syringe fill to your unit mark, and see how many doses the vial holds.
A 30 mg vial, start to syringe
3 mL BAC water
5 mg target dose
How long will one vial last?
Plan re-orders: enter your vial size, dose per injection and how often you inject.
Units & conversions
| Draw volume | On a U-100 syringe |
|---|---|
| 1.0 mL | 100 units |
| 0.5 mL | 50 units |
| 0.25 mL | 25 units |
| 0.1 mL | 10 units |
| 0.05 mL | 5 units |
| Amount | Equals |
|---|---|
| 1 mg | 1000 mcg |
| 0.5 mg | 500 mcg |
| 0.25 mg | 250 mcg |
| Typical BAC water | 1 – 3 mL per vial |
| Insulin syringe | U-100 · 100 units = 1 mL |
Reconstitution tips
Common questions
How much bacteriostatic water should I use?
There's no single right answer — more water simply spreads the same peptide across a larger volume, making small doses easier to measure. 1–3 mL per vial is typical. Load a peptide in the calculator to see the volume its protocol recommends.
What are the "units" on the syringe?
They're the marks on a U-100 insulin syringe, where 100 units = 1 mL. The calculator converts your draw volume into units so you can read it straight off the barrel — e.g. 0.5 mL = 50 units.
Can I enter doses in mcg?
Yes. Toggle the vial or dose unit between mg and mcg (1 mg = 1000 mcg). The math and syringe mark update automatically.
Why is my draw over 1 mL?
Your concentration is too low for that dose — the volume won't fit one insulin syringe. Add more peptide strength, lower the dose, or reconstitute with less BAC water to raise the concentration.
How many doses will a vial give me?
The calculator shows "total doses in vial" = vial strength ÷ dose per injection. Use the planner above to turn that into weeks of supply based on how often you inject.