Divide your dose by the vial’s concentration, then multiply by 100 for a U-100 insulin syringe. Concentration is the milligrams in the vial divided by the milliliters of bacteriostatic water you added. A 5 mg vial mixed with 2 mL is 2.5 mg per mL, so a 250 mcg dose (0.25 mg) is 0.1 mL — 10 units. A small slip turns a precise dose into a guess, so enter your numbers below and the calculator shows the draw on a syringe.
Enter your vial size, water, and dose to see your draw.
Safety first. This tool is a math aid for educational purposes only — not dosing advice. It cannot verify product purity, sterility, or whether any compound is appropriate for you. Always work with a licensed medical professional.
Peptide (mg) ÷ water (mL) = how many mg sit in each mL. More water = weaker concentration = larger volume per dose.
Target dose ÷ concentration = the mL you draw. Multiply by 100 to get insulin-syringe units.
Aim for a draw that lands on easy-to-read tick marks. If units are tiny, add less water next time.