Reconstituting a peptide? Enter your vial size, how much bacteriostatic water you added and the dose you want — get the exact units to draw on an insulin syringe.
For research and informational purposes only. Not medical advice. Always confirm with a qualified professional.
This calculator works out how many units to draw on an insulin syringe after you reconstitute a peptide with bacteriostatic water. Choose the peptide amount in your vial (mg), how much bacteriostatic water you added (ml), the dose you want (mcg or mg) and your syringe size. The result updates instantly and also shows the solution concentration and how many doses you get from one vial.
Concentration (mg/ml) = peptide amount (mg) ÷ water volume (ml). For example, a 10 mg peptide reconstituted with 2 ml of bacteriostatic water gives a 5 mg/ml solution. To measure a 250 mcg dose you would draw 5 units on a 0.5 ml insulin syringe.
First find the concentration: divide the peptide amount in the vial (mg) by the amount of bacteriostatic water you added (ml). Then divide your desired dose (in mg) by that concentration to get the volume per dose in ml. Multiply the ml by 100 to get the units on a standard U-100 insulin syringe.
Concentration (mg/ml) = peptide (mg) ÷ water (ml). For example, a 10 mg vial reconstituted with 2 ml of bacteriostatic water gives 5 mg/ml. To draw a 250 mcg (0.25 mg) dose at 5 mg/ml you need 0.05 ml, which is 5 units on an insulin syringe.
On a standard U-100 insulin syringe, 100 units equals 1 ml. So 50 units is 0.5 ml and 10 units is 0.1 ml. The calculator converts your dose volume into these units automatically.
There is no single correct amount — more water makes the dose easier to measure but more dilute. Many researchers use 1–3 ml per vial. The recommended amount can vary per peptide, so check the specific product's documentation.