DNA Statistics

DNA sequences

Output

How to count bases and GC content

Paste one or more DNA sequences, as plain text or FASTA.
The counts of A, C, G and T, the GC and AT content, purines, pyrimidines and all 16 dinucleotides appear for each sequence.
Copy output or Download saves the result.

Frequently asked questions

How is GC content worked out?

G plus C divided by the length of the sequence. Ambiguity codes such as N count towards the length under Other, so a sequence with many Ns shows a lower GC content.

Is my sequence uploaded?

No. Everything runs in your browser, so your sequences never leave your device.

Can I see the DNA in 3D?

The DNA and RNA Folding Viewer shows how a single strand folds on itself, stems as helices and loops as rings, with its free energy, melting temperature and GC content.

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Related simulations

DNA and RNA Folding Viewer

Guides

DNA and Protein Sequence Statistics Explained How to Find CpG Islands in a DNA Sequence How to Calculate GC Content DNA and molecular biology: study guide Biological macromolecules: study guide