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Blue Collar Education Center · interactive tool

Peptide Molecular-Weight Lookup

Estimate the average neutral molecular weight of an unmodified peptide from its amino-acid sequence.

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REFERENCE / SEQUENCE

Peptide molecular-weight estimator

Enter a standard one-letter amino-acid sequence to estimate the unmodified peptide's average neutral molecular weight.

Normalized sequenceGPPPGKP
Residue count7
Estimated average MW648.76 Da

This sequence-only estimate excludes salts, counterions, conjugates, terminal modifications, oxidation, labeling, and formulation components. Confirm exact mass with an authoritative sequence record or analytical data.