Peptide Calculator Pro

Free browser-based calculators for peptide sequences and solutions. From a one-letter amino acid sequence it computes average molecular weight, monoisotopic mass, molecular formula and m/z for charge states, with N-terminal acetylation, C-terminal amidation and disulfide options. It also computes net charge at a chosen pH, isoelectric point (pI) and GRAVY using EMBOSS pKa values. A concentration calculator converts peptide mass and volume to mg/mL, mM or µM from the molecular weight. All calculations run client-side and no login is required.