Peptide Molecular Weight Calculator
How to use this peptide analytical tool
Simply type in, or copy and paste, peptide or protein fragment amino-acid sequence, including modifications, spacers, or special termini, and press the “Calculate” button.
The peptide molecular weight calculator will display average and monoisotopic mass of the molecule, as well as a table of mass divided by charge values, both in positive and negative scan modes, which is useful for mass spec analysis.
Take a look at the following posts for demonstration of what the calculator is capable of:
Peptide Properties Calculator User Guide
For a quick sample of the output screen, you can load a random peptide from the list of peptides the analytical tool has calculated before. Please note: this is a rapidly changing project in development; look, feel, and functionality may and will change.
Linear peptide in one-letter code: KYICNSSCM
Linear peptide in three-letter code: Arg-Gly-Asp-Cys
Head-to-tail cyclic peptide: cyclo(GRGDSP)
Peptide with two disulfide bridges: [Cys2-Cys10,Cys4-Cys8] ACDCRGDCFCG
Peptide with Biotin on N-terminal: Biotin-YGRKKRRQRRR
Peptide with disulfide bridge (1-6), capped at C-terminal (amide): Cyclic CYFQNCPRG-NH2
Peptide with isotopically labeled Valine and Isoleucine:
Peptide with Phosphoserine: Arg-Arg-Ala-Ser(PO3)-Pro-Val-Ala
Also on this site
Try the sequence splitter tool for fragmenting sequences of proteins and peptides with optional overlap.
Use the scrambler tool to randomly shuffle peptide or protein sequences.