ChemCalc - Molecular Formula Calculator
ChemCalc is a free online tool for mass spectrometry. Calculate
molecular weight, monoisotopic mass, and isotopic distribution from a
molecular formula. Find possible molecular formulas from a
monoisotopic mass. Analyze peptide, nucleotide, and polymer
fragmentation.
Please enable JavaScript to use the interactive application.
Reference: Patiny L, Borel A. ChemCalc: a building block for
tomorrow's chemical infrastructure. J Chem Inf Model. 2013. DOI:
10.1021/ci300563h
Peptide and protein fragmentation calculator Compute a, b, c, x, y and z fragment ion masses for any peptide or protein sequence, with configurable ionization, to interpret tandem mass spectra (MS/MS).