GC Content Calculator
Calculate DNA GC content from base counts.
GC Content measurements
Enter your values, then calculate.
Result
How to calculate gc content
GC content is the percentage of a DNA or RNA sequence made up of guanine and cytosine bases — a fundamental measure in molecular biology and genomics.
How the calculation works
GC content = 100 × (Guanine + Cytosine) ÷ (Guanine + Cytosine + Adenine + Thymine).
Example
20 guanine, 25 cytosine, 22 adenine, 18 thymine: 100×(20+25)÷(20+25+22+18) = 100×45÷85 ≈ 52.9%.
Frequently asked questions
How is Result calculated?
Result = 100 × ([Guanine count] + [Cytosine count]) ÷ ([Guanine count] + [Cytosine count] + [Adenine count] + [Thymine count]).
Is the GC Content Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
GC Content Calculator
GC content = 100 × (Guanine + Cytosine) ÷ (Guanine + Cytosine + Adenine + Thymine).
Let's understand your gc content result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for GC Content
- GC content varies by organism and affects DNA stability — higher GC content generally means a higher melting temperature.
- This is commonly used in primer design for PCR, since GC content affects primer binding characteristics.
Common GC Content Mistakes to Avoid
- Forgetting to include all four base counts in the denominator, which would produce an incorrect percentage.
When to Use This Calculator
GC content is the percentage of a DNA or RNA sequence made up of guanine and cytosine bases — a fundamental measure in molecular biology and genomics.