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Peptide Sequence Builder

Peptide Sequence Builder is a straightforward yet powerful tool for constructing custom peptides by selecting from L- or D-amino acids and specifying the C-terminus. You can enter your sequence in either three-letter or one-letter code, and the tool instantly calculates the peptide’s molecular weight and formula.

Please select L or D isomer of an amino acid and C-terminus COOH CONH2

Alanine Arginine Asparagine Aspartic Acid Cysteine

Glutamine Glutamic acid Glycine Histidine Isoleucine

Leucine Lysine Methionine Phenylalanine Proline

Serine Threonine Tryptophan Tyrosine Valine

Peptide Sequence(N =>C):
Three Letter:

One Letter:

Molecular Formula:
Molecular Weight: