Genomics %G~C Content Calculator

Here's how.

Enter your DNA sequence in the box:

Instructions

Copy and paste the DNA sequence you want to analyze into the box.
Press "Calculate" to count the bases and determine the %G~C content.
Press "Clear Form" to clear all the fields, preparing the calculator for its next count.
Note: If the calculator detects characters other than A, T, G, and C, it will notify you, then delete the offending characters. The calculator recognizes sequences in FASTA format, simply deleting the FASTA "name" before counting the bases.