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Peptide Mass Calculator

It is often important to know the molecular weight of a peptide or protein sequence. This program will take a protein sequence and calculate the molecular weight. The program will ignore numbers, spaces or characters like U or X which do not correspond to one of the amino acids from the table below.

Amino Acid 3-Letter Code 1-Letter Code Alanine Ala A Cysteine Cys C Aspartate Asp D Glutamate Glu E Phenylalanine Phe F Glycine Gly G Histidine His H Isoleucine Ile I Lysine Lys K Lysine Lys K Leucine Leu L Methionine Met M

Amino Acid 3-Letter Code 1-Letter Code Asparagine Asn N Proline Pro P Glutamine Gln Q Arginine Arg R Serine Ser S Threonine The T Valine Val V Tryptophan Trp W Tyrosine Tyr Y Asaragine Asx B Glutamine Glx Z

Enter Peptide Sequence in Box (please use one letter code)

There are amino acids, and Molecular Weight is g/mol