Peptide Reconstitution & Dosage Calculator
Enter your vial size, bacteriostatic water, and target dose — get the exact number of units to draw on an insulin syringe, instantly and free.
Calculated on a U-100 insulin syringe (100 units = 1 mL). This is reconstitution arithmetic for peptide, not a dosing recommendation. Verify against your product label and a qualified professional.
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All peptides →How the peptide calculator works
Reconstitution is the step where a freeze-dried peptide powder is dissolved into an injectable solution using bacteriostatic water. The tricky part is not the mixing — it is the math that turns your target dose in micrograms into a readable number of units on an insulin syringe. Get the concentration wrong and every dose is off.
This calculator removes the guesswork. It takes three numbers — the milligrams of peptide in your vial, the milliliters of bacteriostatic water you add, and your target dose in micrograms — and returns the exact draw in both syringe units and milliliters, plus the concentration, micrograms per unit, and how many doses your vial holds. For a specific compound, open its page for a pre-filled calculator and a reconstitution chart.
Frequently asked questions
How do you calculate a peptide dose?+
Divide the peptide amount in the vial (mg) by the bacteriostatic water you added (mL) to get the concentration in mg/mL. Then units to draw on a U-100 insulin syringe = dose (mcg) × water (mL) ÷ (10 × vial mg). This calculator does the arithmetic for you.
How much bacteriostatic water do I add to a peptide vial?+
The water amount only changes the concentration, not the total peptide. Adding more water spreads the dose across more syringe units, which is easier to read. Use the "Tip" suggestion above to land your dose on a round number of units.
What is a unit on an insulin syringe?+
On a U-100 insulin syringe, 100 units = 1 mL, so 1 unit = 0.01 mL. The result box shows both units and the equivalent volume in mL.
Is this peptide calculator free?+
Yes. PeptideCalc is completely free to use, with no sign-up. Pre-configured calculators for specific peptides are available on each peptide page.