FOREVERBuy one peptide or lab supply, get one 50% off.Peptides, reconstitution solution, and syringes. Rewards still apply. Not for Blue Collar Gear.Shop now →
CUMULATIVE ORDER BENEFITS$200 RECONSTITUTION SOLUTION · $300 STANDARD SHIPPING · $500 RESEARCH VIAL CHOICE · $600 VIP SHIPPING · $700 DOUBLE POINTS
FOR LABORATORY RESEARCH USE ONLY · NOT FOR HUMAN OR VETERINARY USE · 21+
Education Hub About Us
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.

Blue Collar Education CenterAll tools
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.