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Peptide Molecular Weight Calculator

Molecular Weight notes

The molecular weights below are those of the free acid and not the residue, which is used in the calculations performed by the Peptide Properties Calculator. Subtracting an the weight of a mole of water (18g/mol) yields the molecular weight of the residue. The weights used for Glx and Asx are averages.

Three to One Letter Converter

* Pull down the menu to view the 3 to 1 conversion.

Enter Peptide Sequence in Box (use one letter code)

Hydropathy Plot Window size:
Length: Residues
Molecular Weight: g/mol
Extinction Coefficient: cm -1 M-1
Approximate Volume: A3

Three letter code

Amino Acid Codes Table

  • A - Alanine (Ala)
  • C - Cysteine (Cys)
  • D - Aspartic Acid (Asp)
  • E - Glutamic Acid (Glu)
  • F - Phenylalanine (Phe)
  • G - Glycine (Gly)
  • H - Histidine (His)
  • I - Isoleucine (Ile)
  • K - Lysine (Lys)
  • L - Leucine (Leu)
  • M - Methionine (Met)
  • N - Asparagine (Asn)
  • P - Proline (Pro)
  • Q - Glutamine (Gln)
  • R - Arginine (Arg)
  • S - Serine (Ser)
  • T - Threonine (Thr)
  • V - Valine (Val)
  • W - Tryptophan (Trp)
  • Y - Tyrosine (Tyr)
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