Peptide reconstitution calculator
Enter the vial strength, the volume of bacteriostatic water added and the dose you want to draw. The calculator returns the resulting concentration, the volume in millilitres and the reading on an insulin syringe.
Your vial
Results
10.0 units on a 100-unit syringe
Nearest readable mark: 10.0 units (250 mcg actual)
- Concentration
- 2,500 mcg/ml
- 2.50 mg/ml
- Volume to draw
- 0.100 ml
- Doses per vial
- 20.0
- Syringe
- 100 units (1 ml)
For laboratory research use only. Nothing here is dosing guidance or medical advice. Always verify calculations independently before use.
How the maths works
Reconstitution does not change how much peptide is in the vial — it only changes how concentrated it is. A 5 mg vial holds 5 mg whether you add 1 ml or 3 ml of bacteriostatic water.
Concentration = peptide (mcg) ÷ water (ml). A 5 mg vial with 2 ml gives 5,000 ÷ 2 = 2,500 mcg/ml.
Volume to draw = dose (mcg) ÷ concentration (mcg/ml). A 250 mcg dose at 2,500 mcg/ml is 0.1 ml.
Syringe units — a 100-unit insulin syringe holds 1 ml, so one unit is 0.01 ml. 0.1 ml therefore reads as 10 units. On a 50-unit (0.5 ml) syringe one unit is also 0.01 ml, but the barrel only holds half as much.
Choose a water volume that puts your typical draw between roughly 10 and 50 units — small enough to measure accurately, large enough to read off the barrel without guesswork.