Gig Fraction is a term used to describe the ratio of a gigabyte (GB) to a megabyte (MB). A gigabyte is equal to 1, 024 megabytes, so the gig fraction is 1/1, 024. A byte is the smallest unit of digital information and is equal to 8 bits. Therefore, a megabyte is equal to 1, 048, 576 bytes and a gigabyte is equal to 1, 073, 741, 824 bytes. The gig fraction is a useful way to measure the size of digital files.