First find the concentration: divide the peptide amount (in mcg) by the bacteriostatic water added (in mL). Then divide your target dose (mcg) by that concentration to get the volume to draw (mL), and multiply by 100 to convert to units on a U-100 insulin syringe. This calculator does all of that automatically.

There's no single right amount — more water means a more dilute solution and larger, easier-to-measure draws; less water means smaller draws. Common choices are 1–3 mL per vial. Pick an amount that puts your target dose at an easy-to-read number of units, and follow your clinician's instructions.

It depends on how you reconstituted the vial. For example, a 5 mg vial reconstituted with 2 mL of water is 2,500 mcg/mL — so a 250 mcg dose is 0.1 mL, which is 10 units on a U-100 insulin syringe. Enter your own numbers above to see your exact result.

U-100 means 100 units per 1 mL. Most insulin syringes used for subcutaneous peptide injections are U-100, so 100 units = 1 mL and 10 units = 0.1 mL.

No. This calculator is an educational tool for arithmetic only. It does not recommend doses or treatments. Always follow the instructions of a licensed clinician.