How the vial calculator works

Save a vial once: the amount of peptide on the label and the bacteriostatic (BAC) water you added. The calculator keeps its concentration, so each time you open it you only type the amount you want to measure, and it shows the units on a U-100 insulin syringe (100 units = 1 mL). If you log a draw, it is subtracted from the vial so you can see roughly what's left.

Vials are stored in this browser on this device, not on a server, and the page works offline once it has loaded. Use Back up to save a copy of your vials as a file.

Add it to your home screen

On iPhone, open this page in Safari, tap the Share button, then Add to Home Screen. On Android or desktop Chrome, use Install in the browser menu.

This is a math tool. It converts an amount you already have into syringe units; it does not tell you what amount to use. Presets fill in a vial size and water volume only. Peptides sold as research chemicals are not FDA-approved products, and nothing here is medical advice.

Per-compound calculators · How to reconstitute peptides · Syringe units to mg