Mass Reference

If you are looking for a quick reference, below are two tables sorted by name and by mass. Download the more detailed reference table (above) for quick and easy access to mass tables, reverse mass tables, common amino acid residues, common PTMs, and fragment ion tables.



Sort by Name

Name 3-letter code 1-letter code Monoisotopic Mass Average Mass Composition
Alanine Ala A 71.03711 71.08 C3H5NO
Arginine Arg R 156.10111 156.2 C6H12N4O
Asparagine Asn N 114.04293 114.1 C4H6N2O2
Aspartic Acid Asp D 115.02694 115.1 C4H5NO3
Cysteine Cys C 103.00919 103.1 C3H5NOS
Glutamic Acid Glu E 129.04259 129.1 C5H7NO3
Glutamine Gln Q 128.05858 128.1 C5H8N2O2
Glycine Gly G 57.02146 57.05 C2H3NO
Histidine His H 137.05891 137.1 C6H7N3O
Isoleucine Ile I 113.08406 113.2 C6H11NO
Leucine Leu L 113.08406 113.2 C6H11NO
Lysine Lys K 128.09496 128.2 C6H12N2O
Methionine Met M 131.04049 131.2 C5H9NOS
Phenylalanine Phe F 147.06841 147.2 C9H9NO
Proline Pro P 97.05276 97.12 C5H7NO
Serine Ser S 87.03203 87.08 C3H5NO2
Threonine Thr T 101.04768 101.1 C4H7NO2
Tryptophan Trp W 186.07931 186.2 C11H10N2O
Tyrosine Tyr Y 163.06333 163.2 C9H9NO2
Valine Val V 99.06841 99.13 C5H9NO

Sort by Mass

Name 3-letter code 1-letter code Monoisotopic Mass Average Mass Composition
Glycine Gly G 57.02146 57.05 C2H3NO
Alanine Ala A 71.03711 71.08 C3H5NO
Serine Ser S 87.03203 87.08 C3H5NO2
Proline Pro P 97.05276 97.12 C5H7NO
Valine Val V 99.06841 99.13 C5H9NO
Threonine Thr T 101.04768 101.1 C4H7NO2
Cysteine Cys C 103.00919 103.1 C3H5NOS
Isoleucine Ile I 113.08406 113.2 C6H11NO
Leucine Leu L 113.08406 113.2 C6H11NO
Asparagine Asn N 114.04293 114.1 C4H6N2O2
Aspartic Acid Asp D 115.02694 115.1 C4H5NO3
Glutamine Gln Q 128.05858 128.1 C5H8N2O2
Lysine Lys K 128.09496 128.2 C6H12N2O
Glutamic Acid Glu E 129.04259 129.1 C5H7NO3
Methionine Met M 131.04049 131.2 C5H9NOS
Histidine His H 137.05891 137.1 C6H7N3O
Phenylalanine Phe F 147.06841 147.2 C9H9NO
Arginine Arg R 156.10111 156.2 C6H12N4O
Tyrosine Tyr Y 163.06333 163.2 C9H9NO2
Tryptophan Trp W 186.07931 186.2 C11H10N2O