Reconstitution Calculator

Pick a compound → pick vial size → pick BAC water volume. See the concentration, research dose math, and a visual syringe draw. Everything in one step.

Research Use Only. Compounds and volumes reflect common research practice. Not personal-use recommendations. Not medical advice. Many compounds below are not FDA-approved; verify regulatory status before any research activity.

1. Choose a compound

Don't see your peptide?

The math (if you want it)

Concentration (mg/ml) = vial size (mg) ÷ BAC water volume (ml). Example: 5 mg vial + 2 ml BAC = 2.5 mg/ml.
Concentration (mcg/ml) = mg/ml × 1000. Example: 2.5 mg/ml = 2,500 mcg/ml.
Volume to draw (ml) = target research dose (mcg) ÷ concentration (mcg/ml). Example: 500 mcg ÷ 2,500 mcg/ml = 0.2 ml.
U-100 insulin syringe units = volume (ml) × 100. Example: 0.2 ml × 100 = 20 units.

“U-100” means 100 units per 1.0 ml. This is the standard insulin syringe. If using a different syringe (U-40, tuberculin 1 ml), the unit scale changes — verify before drawing.

Frequently asked questions

What is BAC water and why is it used?

Bacteriostatic (BAC) water is sterile water with a small amount of benzyl alcohol added as a preservative. It's used to reconstitute lyophilized (freeze-dried) peptide powder into a liquid solution. Common volumes are 1–3 ml per vial.

How do I calculate peptide reconstitution?

Divide the vial size (mg) by the BAC water volume (ml) to get concentration in mg/ml. Multiply by 1000 for mcg/ml. Then divide your target dose (mcg) by the mcg/ml concentration to get the volume to draw.

How many units do I draw on an insulin syringe?

A U-100 insulin syringe measures 100 units per 1.0 ml. Multiply the volume to draw (in ml) by 100 to get the syringe units. Example: 0.2 ml × 100 = 20 units.