Research Tool

Peptide Reconstitution Calculator

Work out the concentration of a reconstituted peptide solution, or how much solvent to add to reach a concentration you're aiming for.

For laboratory research use only. This tool performs a concentration calculation. It is not dosing guidance, and our products are not for human or veterinary use.

Enter how much peptide is in the vial and how much solvent you're adding.

How the calculation works

Concentration is the mass of peptide divided by the volume of solvent it is dissolved in:

concentration (mg/ml) = peptide mass (mg) ÷ solvent volume (ml)

Rearranged, that also tells you how much solvent to add to reach a concentration you're aiming for:

solvent volume (ml) = peptide mass (mg) ÷ target concentration (mg/ml)

Adding less solvent gives a more concentrated solution; adding more gives a more dilute one. The quantity of peptide in the vial never changes — only the concentration of the solution you prepare from it.

Preparing your solution

For guidance on solvents, handling and storing peptides before and after reconstitution, see our full guide.