17+ Peptide Mw Calculator. Pepcalc.com is a free online tool that calculates and estimates peptide properties such as molecular weight, extinction coefficient, net charge, isoelectric point and solubility. Enter an amino acid sequence and get the molecular weight and extinction coefficient of the peptide or protein.

See examples of linear, cyclic, branched, and isotopically labeled. Use goldbio’s protein and peptide molecular weight calculator to evaluate your protein or peptide sequence. Enter an amino acid sequence and get the molecular weight and extinction coefficient of the peptide or protein.








