Use this free peptide calculator to turn the mixing math into a syringe mark. Enter your vial size (mg), the bacteriostatic water (mL) you added, and your dose, and it shows the units to draw on a U-100 insulin syringe, the concentration (mg/mL), and how many doses the vial holds. It does the arithmetic only — it never recommends a dose.
Concentration = vial mg × 1000 ÷ water mL (in mcg per mL). Units to draw = dose ÷ concentration × 100 on a U-100 syringe, where 100 units = 1 mL. And 1 mg = 1000 mcg — mixing those up is the most common serious error, so the calculator shows both.
Illustrative only, not a recommendation. A 10 mg vial with 2 mL of bacteriostatic water is 5 mg/mL. For a 0.25 mg dose: 0.25 ÷ 5 = 0.05 mL = 5 units. Add more water and the same dose becomes more units — which is why you always use your own vial’s numbers.
This calculator prepares the solution math; it does not choose a dose or give medical advice. Your dose is a decision for you and your prescriber. Research peptides are not for human consumption in most jurisdictions — only FDA-approved drugs and prescriptions from licensed 503A/503B compounders are permitted where applicable.
It turns the mixing math into a syringe mark. You enter the vial size (mg), the bacteriostatic water you added (mL), and your dose, and it shows the units to draw on a U-100 insulin syringe, the concentration (mg/mL), and how many doses the vial holds. It does the arithmetic only — it never chooses a dose.
No. It is mixing-math, not a dosage calculator. Your dose is a decision you make with your prescriber; this tool just converts that dose into a syringe mark at your vial’s concentration.
Concentration = vial mg × 1000, divided by the water in mL, expressed in mcg per mL (or mg/mL). The units to draw are then the dose divided by the concentration, times 100 on a U-100 syringe.
Yes. It is free, needs no signup, and runs entirely in your browser — the numbers you enter are not sent anywhere.
Bacteriostatic water is commonly used for multi-dose vials; some compounds specify a different diluent. The right diluent for your product is on its label or from your pharmacist.
Yes for the first, no for the second. “Pep calculator” is just shorthand for a peptide calculator, and that is what this is. It is not a dosage calculator: it does arithmetic on the vial size, the water and the dose you enter, and it never suggests what dose to take. Your physician or pharmacist decides that.