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Calculate the molecular weight of a peptide from its amino acid sequence. Enter single-letter amino acid codes or choose a common peptide preset.
Common peptide presets
Enter an amino acid sequence to see results
Educational purposes only
This calculator uses average amino acid residue weights and adds 18.0153 Da for the water molecule (N-terminal H + C-terminal OH). Actual molecular weight may vary due to post-translational modifications, disulfide bonds, or other chemical modifications. Always verify with experimental data.