For laboratory research use only
Peptide reconstitution calculator.
Enter the peptide content on the vial and the diluent volume you add. The calculator returns concentration, molarity, and the volume that holds a given mass, in mL and in U-100 syringe units. No account, no sign-up, works on a phone at the bench.
- Concentration
- 2.5 mg/mL
- 2,500 mcg/mL
- Molarity
- — mM
- needs molecular weight
- Volume per draw
- 0.1 mL
- 10 units on a U-100 syringe
- Draws per vial
- 20
- whole draws at that amount
Arithmetic only: concentration is mass divided by volume, molarity is concentration divided by molecular weight. Use the peptide content printed on the Certificate of Analysis, not the gross powder weight. For laboratory research use only.
Mass over volume
Concentration is the peptide mass divided by the diluent volume. 5 mg in 2 mL is 2.5 mg/mL; the same 5 mg in 1 mL is 5 mg/mL. The amount never changes, only the volume that carries it.
Use the COA number
The label mass is peptide content, not gross powder weight. Counter-ion and residual moisture are often 5 to 20 percent of what is physically in the vial. Our per-lot Certificates of Analysis print the content and the molecular weight this calculator needs.
Units on a U-100
A U-100 syringe is graduated at 100 units per mL, so 0.05 mL reads as 5 units. Volumes under 2 units are hard to read accurately; a smaller diluent volume raises the concentration and the unit count.
Read the full method
The long-form guide covers the peptide-content correction, worked examples, and the molecular-weight arithmetic behind the molarity figure.
All products sold by Bench Grade Peptides are for laboratory research use only. Not for human or veterinary use. This calculator performs arithmetic on the numbers you enter and makes no recommendation about any material.