Enter the peptide amount in your vial, how much bacteriostatic water you add, and your desired dose. The tool returns the concentration, how many units to draw on a U-100 insulin syringe, and how many doses the vial holds.
Educational tool — not medical advice. This calculator only performs arithmetic on numbers you enter. It does not recommend any dose, compound, or protocol. The peptides referenced across this site are research chemicals not approved for human use by the FDA or any major regulator. Always consult a licensed healthcare professional. See our full disclaimer.
Reconstitution is just arithmetic once you know your three inputs. The tool applies the relationships below to whatever numbers you type.
Why 100 units per mL? A standard U-100 insulin syringe is graduated so that the full 1 mL barrel reads as 100 units. Each unit therefore equals 0.01 mL. That is why "units" and "mL" are interchangeable once you multiply or divide by 100 — no insulin is involved, the gradations are simply a convenient fine scale.
For your current vial size (5 mg) and dose (250 mcg), here is what different water volumes would give you. These columns update automatically as you change the inputs above.
| Water added | Concentration | Units to draw (U-100) | Doses per vial |
|---|
Convert between mg, mcg, mL and U-100 syringe units for any concentration.
ToolPlot exponential decay and see time to 50/25/10/5% remaining.
GuideStep-by-step aseptic technique and the science behind mixing peptides.
GuideWhat it is, why it is used for reconstitution, and storage notes.