Gibibytes to gigabytes (GiB to GB)

One gibibyte is exactly 1.073741824 gigabytes. That is the definition of the prefixes, not a measurement: the decimal SI prefixes (kilo, mega, giga, tera) step by exactly 1,000, and the binary IEC prefixes (kibi, mebi, gibi, tebi) step by exactly 1,024. The two families are both exact; the trouble is only that software and storage labels do not always say which one they mean.

Worked through: 16 GiB x 1.07374182 = 17.1799 GB.

Going the other way, one gigabyte is 0.9313225746 gibibytes.

For mental arithmetic: Multiply by 1.074, or add about 7%.

GiB vs GB: a gibibyte is 2^30 bytes, 1,073,741,824, and a gigabyte is 10^9, so one GiB is about 7.4% more than one GB. GiB is what Linux prints (free -h and df -h count in powers of 1,024), what a cloud provider means when it sizes a virtual machine's memory or a block volume in GiB, and what Kubernetes means by Gi. GB is what a drive box, a phone and most download pages mean. Converting a 16 GiB server to decimal gives 17.18 GB, which is why a spec sheet and a terminal can describe the same machine with different numbers.

Precision is worth matching to the input. A measurement given as 1 GiB carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.