Peptide reconstitution calculator
After you mix a peptide vial with bacteriostatic water, this works out the concentration, how much liquid to draw for a given dose, and where that lands on an insulin syringe. It's arithmetic only — enter the dose your prescriber gave you; we don't recommend doses.
- Concentration
- —
- Volume per dose
- —
- Theoretical full doses
- —
- Per-unit amount
- —
Enter your label details and prescribed dose to calculate.
Syringe units describe volume, not peptide potency. ≈ means rounded for display. Do not round your prescribed dose to a syringe marking. Dose counts exclude losses and do not establish storage life or a discard date.
This tool performs unit conversions only and is not medical advice or a dosing recommendation. Doses, mixing ratios, and storage should be set with your licensed prescriber. See our Medical Disclaimer. Need the underlying method? Read the reconstitution guide.
Questions about the calculator
How do I use this peptide reconstitution calculator?
Choose how you know the strength of your solution: the concentration printed on the label, or the amount of peptide in the vial and the final volume of liquid. Enter the dose your prescriber gave you and pick your syringe. The calculator returns the volume to draw in mL and where that lands on the syringe in units.
How is the concentration worked out?
Milligrams of peptide in the vial divided by the final volume of solution in mL. A vial holding 10 mg, made up to a final 2 mL, is 5 mg/mL, so each 0.1 mL holds 0.5 mg. Use the final volume the pharmacy or manufacturer confirms: the water added is not always the final volume.
What is a unit on an insulin syringe?
A volume, not an amount of peptide. On a U-100 syringe 100 units fill 1 mL, so one unit is 0.01 mL; on a U-40 syringe 40 units fill 1 mL. How much peptide a unit holds depends on the concentration, which is why the same dose can be a different number of units in two vials.
How much bacteriostatic water should I add?
We do not say: the volume is set by the dispensing pharmacy or your prescriber, and it changes the concentration of everything you draw afterwards. If your vial arrives already prepared, use the concentration on its label. The reconstitution guide explains the method step by step.
Does the calculator tell me what dose to take?
No. It converts a dose you already have into a volume and syringe units. The dose, the mixing volume and how long a mixed vial keeps come from your licensed prescriber and the pharmacy.
The method behind the numbers, with what you need and how to store a mixed vial: peptide reconstitution guide.