Convert mebibytes to gigabytes

One mebibyte is 0.001048576 gigabytes. To convert any amount, multiply by 0.001048576. Going the other way, one gigabyte is 953.674316 mebibytes.

Multiply the mebibyte figure by 0.001048576. So GB = MiB × 0.001048576. For a quick mental estimate, dividing by about 953.67 gets you close enough for most everyday purposes.

One mebibyte is about 5% more than a megabyte. A mebibyte is exactly 1,024² bytes. The binary prefixes — kibi, mebi, gibi — were standardised by the IEC in 1998 precisely to end the ambiguity, though adoption is patchy.

One gigabyte is about two hours of HD video. A gigabyte is one billion bytes. A drive sold as 1 TB holds 1,000 GB decimal, which your operating system may display as 931 GiB — nothing is missing, the units differ.

Because two different definitions are in play. Storage manufacturers use decimal units — 1 TB means exactly one trillion bytes. Windows and many other systems display binary units but label them with decimal names, so they show that same drive as 931 "GB" when they mean 931 gibibytes. Nothing is missing and nothing is faulty; the drive holds exactly what it says, measured differently. The IEC standardised kibi, mebi and gibi in 1998 specifically to end this, but adoption has been patchy.

Yes — both decimal and binary prefixes are exactly defined powers, so every figure here is exact rather than approximate. The results are shown to seven significant figures; the underlying arithmetic uses full double precision.