Convert between peptide mass and solution volume. Enter the vial size and the amount of diluent to get the resulting concentration, or work backwards from a concentration you need to the volume of bacteriostatic water to add.
| Marking | Volume | Also written as |
|---|---|---|
| 10 units | 0.10 mL | 1/10 of a 1 mL syringe |
| 20 units | 0.20 mL | 1/5 of a 1 mL syringe |
| 50 units | 0.50 mL | half a 1 mL syringe |
| 100 units | 1.00 mL | a full 1 mL syringe |
Concentration = peptide mass ÷ diluent volume. A 10mg vial reconstituted with 2mL of bacteriostatic water gives 10 ÷ 2 = 5 mg/mL. Adding more water gives a lower concentration in the same total amount of peptide — the quantity of peptide in the vial never changes, only how dilute it is.
Lyophilized powder adds negligible volume, so the diluent volume and the final solution volume are treated as the same. That approximation holds at these scales.
Add diluent slowly down the inner wall of the vial rather than directly onto the powder, and swirl gently rather than shaking — mechanical shear and aeration both degrade peptides. A correctly reconstituted solution is clear and colourless.
This tool converts between mass and volume. It does not recommend quantities, and nothing here constitutes dosing guidance. All products are supplied for laboratory research use only and are not for human consumption.