Mebibytes to kibibytes (MiB to KiB)

One mebibyte is exactly 1,024 kibibytes. 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: 8 MiB x 1,024 = 8,192 KiB.

Going the other way, one kibibyte is 0.0009765625 mebibytes.

For mental arithmetic: Multiply by 1,024. 1 MiB is 1,024 KiB and 4 MiB is 4,096 KiB.

Exactly 1,024 KiB to the MiB. Settings that count in kibibytes are older and lower-level than the ones that count in mebibytes: the shell's ulimit -v and many kernel parameters take KiB, and /proc/meminfo on Linux prints kB that are really KiB. So 512 MiB entered there is 524,288, not 512,000. One MiB is also 256 memory pages of 4 KiB each, which is the arithmetic behind page-table and huge-page sizing.

Precision is worth matching to the input. A measurement given as 0.5 MiB carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.