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Peptide Calculator

Peptide Calculator

Welcome to Creative Peptides’s online peptide calculator. Use this free peptide tool to calculate the chemical formula and molecular weight of your peptide.

This online peptide calculator determines the chemical formula and molecular weight of your peptide of interest. You can include in your calculation post-translational modifications, such as N- and C-terminal modifications.


Input your peptide's sequence data.  Please use only the one letter code specified on our Amino Acid Code Table. 

Enter Peptide Sequence in Box (use one letter code):

N-Terminal Modification:
C-Terminal Modification:

Molecular Weight:
Molecular Formula:
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