Peptide reconstitution calculator

Divide the vial mass by the water volume to get the concentration in mg/ml. Divide your dose by that concentration to get the volume of one injection in ml. On a U-100 insulin syringe every 0.01 ml is one unit, so multiply that volume by 100. The calculator does exactly this and shows both steps.

More water gives larger, easier-to-measure draws; less water gives smaller draws that fit smaller barrels. 2 ml is the most common choice for a 5–10 mg vial. Pick the amount whose draw lands comfortably on your syringe's scale — the fit line under the result says when a draw is too fine to measure or too big for the barrel.

Yes. Switch the device to Pen and the calculator speaks pen: you set the dial's click size (1 unit on most reusable cartridge pens, ½ unit on half-unit models) and the pen's maximum per injection (30, 60, or 80 units). The result is the number to dial in the dose window, the calculator warns when a dose lands between clicks, and when a dose exceeds the pen's per-injection maximum it shows the split — or the water volume that gets it back to one injection.

U-100 is the standard insulin syringe: 100 units per millilitre. It is what the units on the barrel are calibrated to. If you have a U-40 or U-500 barrel (rare, mostly veterinary), the unit markings mean something different and this calculator's unit readout will not apply.

Any lyophilized peptide — the math is the same regardless of the compound. The picker lists 74 of the most common ones (GLP-1s like semaglutide, tirzepatide and retatrutide, growth-hormone peptides, healing peptides like BPC-157 and TB-500, and more) purely to label the calculation. Selecting one never changes your numbers.

Yes. Switch to Blend and the calculator handles a vial holding several peptides at once — KLOW, Glow and Wolverine Stack compute here in full. You pick which component to state your dose in, and every other component follows the ratio the vial was actually mixed at, so a 5:1:1:1 vial can't quietly hand you five times the dose you read. The rest of the blend list, and building a vial the list doesn't have, are free in the PeptideLab app.

No. It performs arithmetic on numbers you enter. It does not recommend a dose, a compound, or a protocol, and it never pre-fills a dose for you. For medical decisions, consult a qualified healthcare professional.