Gigabyte (GB) is one of the most commonly used units of digital information which is equal to 1,000,000,000 bytes. However, in computer operating science, the value of 1 GB is considered to be equal to 2 30 or 1024 3 bytes which is equal to 1,073,741,824 bytes. GB is often used for indicating a size of memory or specifying a size of a movie, computer RAM, and so on.