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Peptide reconstitution calculator
Enter how much peptide is in the vial, how much bacteriostatic water you add, and your target dose. It returns the concentration, the volume to draw, and the units on a U-100 insulin syringe. Arithmetic only — research reference, not medical advice.
The math, laid out
Nothing fancy here — three steps, same arithmetic every time you mix a vial.
concentration (mcg/mL) = (mg in vial × 1000) ÷ mL of waterdraw volume (mL) = target dose (mcg) ÷ concentrationinsulin units (U-100) = draw volume (mL) × 100Get the water volume wrong and every dose after it is wrong too — that's the single most common slip-up when people reconstitute. Run the numbers above instead of eyeballing it.
Working with a specific compound? Check its dosing notes in our Protocols section, or see how it fits into a broader Stack before you draw anything.
FAQ
How do I actually reconstitute a peptide?
Draw bacteriostatic water into the vial of lyophilized (freeze-dried) powder. Concentration is just the peptide amount divided by however much water you added — this calculator runs that math and turns your target dose straight into mL and insulin-syringe units.
How many units on the syringe is my dose?
On a U-100 insulin syringe, units = mL drawn × 100. Plug in your vial size, the water you used, and your target dose above and it'll spit out the units for your exact mix — don't reuse someone else's number, your mix is probably different.
Is this medical advice?
No — it's just reconstitution math. It converts the numbers you give it; it's not telling you what dose to take, and most research peptides aren't approved for human use. For compound-specific context, see our Protocols pages.