Peptide Length Calculator

Calculate peptide length, size, and molecular weight

Enter peptide or protein sequence:

Peptide Length Analysis

Peptide Length Calculator for Protein Sequences

Our free peptide length calculator calculates peptide length, amino acid count, and molecular weight for protein and peptide sequences. The peptide length calculator provides essential information for peptide synthesis, protein characterization, and biochemical analysis. Understanding peptide size is crucial for experimental design, purification strategies, and predicting peptide properties.

The tool calculates the total number of amino acids in your sequence, providing peptide length in amino acid residues. It also computes molecular weight and provides classification (short peptide, polypeptide, or protein) based on length. This peptide size calculator is essential for researchers working with synthetic peptides, protein fragments, and recombinant proteins. Use our main sequence analyzer for comprehensive analysis, protein molecular weight calculator for detailed MW analysis, or our amino acid composition tool for composition analysis.

All peptide length calculations are performed instantly in your browser with complete privacy. The peptide length calculator supports sequences of any length, from short peptides (2-50 amino acids) to large proteins (hundreds or thousands of amino acids), making it a versatile tool for biochemists, peptide chemists, and protein researchers.

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