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.
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Reference: Patiny L, Borel A. ChemCalc: a building block for
tomorrow's chemical infrastructure. J Chem Inf Model. 2013. DOI:
10.1021/ci300563h
Atomic elements and isotope reference table A complete periodic table with atomic weights, stable isotope masses, and natural abundances for every element — the reference data behind ChemCalc mass spectrometry calculations.