🧬 Biology & Life Science · Tool #12

DNA GC Content Calculator

Calculate nucleotide counts, GC%, and AT% from a DNA sequence.

Enter your figures

Enter the values below to calculate your result.

A, T, G and C only; spaces and line breaks are ignored.

Calculation Results

Based on the figures you entered.

Enter values and calculate
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About this calculation
Important Sequence tools are educational/reference calculations and do not replace laboratory measurements.

How to use this calculator

What to enter

Enter or select the following as requested: DNA sequence. Follow the units, valid ranges, examples, and options displayed beside each field.

What the result means

The biology result follows the genetic, growth, population, cell-count, or biochemical method named by the calculator and the observations entered. Check sample units, dilution factors, organism or model assumptions, measurement conditions, and whether the method is appropriate for the sample.

When to use it

Use this to support a biology calculation, lab exercise, or preliminary analysis. Follow the relevant laboratory protocol and safety procedures, and verify scientific conclusions against appropriate controls and validated methods.