Peptide dose calculator
Convert vial size, water volume, and your target dose into insulin-syringe units — with concentration and doses-per-vial alongside, so you can sanity-check the math before you ever uncap a needle.
Education only · Not a dosing recommendation · Confirm with a clinician.
Education only · Not a dosing recommendation · Always confirm math with a clinician.
How the math works
Reconstitution is two divisions. First, the concentration: total peptide mass divided by the volume of water you added. A 5 mg vial in 2 mL of bacteriostatic water gives 2,500 mcg per mL. Second, the draw: target dose divided by concentration. A 250 mcg dose at that concentration is 0.1 mL — which on a U-100 insulin syringe reads as 10 units. Doses per vial is just total mass divided by per-dose mass.
Water volume is a comfort knob, not a chemistry one. More water makes each unit on the syringe represent a smaller mass, which is useful for fine-tuning very small doses. Less water gives a smaller draw — easier sub-Q, but harder to titrate.
Dose calculator FAQ
- First find the concentration: divide the peptide mass in the vial (in mcg — multiply mg by 1000) by the volume of bacteriostatic water you added (in mL). Then divide your target dose (in mcg) by that concentration to get the draw volume in mL. Multiply by 100 to get units on a U-100 insulin syringe. The calculator above does all four steps for you.