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Amino Acid Calculator

Amino acid composition and counts for a protein sequence.

Introduction

Amino Acid Calculator — Amino acid composition and counts for a protein sequence. Enter Protein sequence (1-letter codes) to get an instant, accurate result.

Formula

Counts occurrences of each of the 20 standard one-letter amino-acid codes (ACDEFGHIKLMNPQRSTVWY) in the entered protein sequence and reports total sequence length.

Step-by-step

  1. Enter the Protein sequence (1-letter codes).
  2. Click Calculate to see your result instantly.

Real-world example

Example: With Protein sequence (1-letter codes) = MVLTAAGKV, the Amino Acid Calculator gives Length: 9, Counts: 2, 1, 1, 1, 1.

Frequently Asked Questions

What happens with characters that aren't standard amino acids?
Only the 20 standard one-letter codes are counted individually; other letters (like ambiguity codes B, X, or Z) still count toward sequence length but aren't broken out in the per-amino-acid tally.
Is the input case-sensitive?
No, lowercase letters are automatically converted to uppercase before counting.
What inputs does the Amino Acid Calculator need?
You'll need to provide: Protein sequence (1-letter codes). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Amino Acid Calculator?
The Amino Acid Calculator applies the formula exactly as calculated — Counts occurrences of each of the 20 standard one-letter amino-acid codes (ACDEFGHIKLMNPQRSTVWY) in the entered protein sequence and reports total sequence length. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Amino Acid Calculator free to use?
Yes, the Amino Acid Calculator is completely free, requires no signup, and runs instantly in your browser.

About the Amino Acid Calculator

The Amino Acid Calculator uses a real, verifiable formula — Counts occurrences of each of the 20 standard one-letter amino-acid codes (ACDEFGHIKLMNPQRSTVWY) in the entered protein sequence and reports total sequence length. — so results are accurate every time, not an approximation.