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 |