Peptide Reconstitution Calculator

The three numbers reconstitution comes down to

Reconstituting a peptide means dissolving a freeze-dried (lyophilized) amount in a vial with a liquid diluent, usually bacteriostatic water. Once it's dissolved, the whole calculation is just three steps:

1. Concentration = vial amount ÷ diluent volume
2. Dose volume = prescribed dose ÷ concentration
3. Syringe units = dose volume × the syringe's units-per-mL

Worked example

Say you've reconstituted a 10 mg vial with 2 mL of bacteriostatic water, and you've been prescribed a 250 mcg dose, using a U-100 insulin syringe (100 units per mL):

1. Concentration: 10 mg ÷ 2 mL = 5 mg/mL
2. Convert the dose to match: 250 mcg = 0.25 mg
3. Dose volume: 0.25 mg ÷ 5 mg/mL = 0.05 mL
4. Syringe units: 0.05 mL × 100 = 5 units

So you'd draw to the 5-unit mark on a U-100 syringe.

Why the working matters

A single misplaced decimal in this chain -- mg mistaken for mcg, or the wrong diluent volume typed in -- changes the answer completely. Rather than asking you to trust a black-box result, PeptOnyx Calculator shows every step of this working, and warns you before you draw if a measurement falls between graduation marks or exceeds what's left in your vial.

This is a calculator, not a dosing guide

This tool converts a dose you've already been prescribed into a measurement -- it does not recommend doses, protocols, or medications. Always follow your prescription and your healthcare provider's instructions.