Protein Molecular Weight Calculator

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Protein Molecular Weight

Calculate the molecular weight, amino acid composition, and physical properties of any protein sequence.

Input Type *

Significant Figures

Protein Sequence (1-letter code) *

Valid amino acid codes: A, R, N, D, C, E, Q, G, H, I, L, K, M, F, P, S, T, W, Y, V

Show Details

Show Composition

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Molecular Weight

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Molecular Weight

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Sequence Length

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Avg. Residue Mass

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Unique Amino Acids

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out of 20

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Amino Acid Composition

Count and percentage of each amino acid in the protein

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Protein Properties

Physical and chemical properties

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Calculation Details

Step-by-step molecular weight calculation

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Molecular Weight Tips

Understanding protein molecular weight

🧬 Biological Disclaimer: This calculator provides estimates for educational purposes. Actual protein molecular weights may vary due to modifications.