Peptide Calculator

The molecular weight of oligopeptides or proteins can be calculated by summing the molecular weights of their corresponding amino acid sequences. This calculator can calculate the amino acid number, molecular weight, molecular formula and other properties of unmodified oligopeptide or protein, and provide a reference for you to determine the concentration of peptide or protein solution.

How to use this tool

Step 1: Select or enter a single-letter sequence.

Step 2: Click "Calculate" to display the amino acid number, molecular weight, molecular formula and sequence (three-letter form).

Calculate now!

Three to One Letter Converter: Pull down the menu to view the 3 to 1 conversion.

Enter Peptide Sequence in Box (use one letter code)

Length:  Residues

Molecular Weight: g/mol

Molecular formula:
Three letter code:
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