Peptide Mixing Calculator

Find out how strong your mixed vial is, how much liquid to draw, and where that lands on an insulin syringe. This is also called a reconstitution calculator. Already know the syringe mark you want? Switch modes to find how much water to add.

Draw 25 units

    • Concentration—
    • Per unit on the syringe—
    • Volume per draw—
    • Draws per vial—

    Insulin syringes are graduated so a 1 mL (U-100) barrel reads 100 units. These figures are arithmetic for handling a reconstituted vial and are not dosing guidance. All products are supplied for laboratory research use only — not for human or veterinary use, and not for diagnostic or therapeutic application.

    How the math works

    Strength is the peptide in the vial divided by the bacteriostatic water you add. A 10 mg vial mixed with 2 mL of water is 5 mg per mL.

    Amount per draw is the amount you want divided by the strength. 250 mcg (0.25 mg) at 5 mg per mL is 0.05 mL.

    Units come from the marks on the syringe, not from the peptide. A standard 1 mL insulin syringe has 100 marks, called units. So 100 units = 1 mL, and one unit = 0.01 mL. That 0.05 mL draw is 5 units. A 0.5 mL or 0.3 mL syringe uses the same size units. It just holds fewer of them.

    More water doesn’t change the total. It spreads the same milligrams through more liquid. That moves the draw further up the syringe, so it’s easier to measure. With very little water, a draw might be just one or two units, where a tiny mistake makes a big difference.

    Reading the result

    The calculator warns you about two things: a draw bigger than the syringe you picked, and a draw under two units, which is hard to measure. In reverse mode, it also warns you if the water won’t fit in the vial.

    For research use only. Not for use in people or animals. Nothing on this page is dosing advice.