GC Content Calculator

Calculate GC percentage instantly with real-time visualization. Analyze nucleotide composition, AT/GC ratios, and melting temperature for primer design and genome analysis.

What is GC Content?

GC content is the percentage of guanine and cytosine in DNA. Our visual calculator shows nucleotide distribution with interactive charts and detailed statistics.

How to Use This GC Calculator

Quick guide to get results:

  1. Paste your DNA sequence
  2. View instant chart visualizations
  3. Check detailed statistics table

When to Use

This tool is useful when you need to:

  • Primer design and melting temp prediction
  • Analyzing genomic regions and CpG islands
  • Comparing sequence stability
  • Gene expression level prediction

Example Input

Sample input:

GGGGCCCCAAAATTTT

Try with your own sequence or use the Example button.

Example Output

Expected output format:

Visual charts + Table: G: 25%, C: 25%, A: 25%, T: 25% GC: 50% | AT: 50%

Results can be copied or downloaded.

FAQ

Q: Does this tool handle FASTA format?
A: Yes, both single and multiple sequences.

Q: What do the colors in the charts mean?
A: Each nucleotide has a unique color: A=Red, T=Teal, G=Blue, C=Green.