Convert kilobytes to mebibytes

One kilobyte is 0.000953674316 mebibytes. To convert any amount, multiply by 0.000953674316. Going the other way, one mebibyte is 1048.576 kilobytes.

Multiply the kilobyte figure by 0.000953674316. So MiB = KB × 0.000953674316. For a quick mental estimate, dividing by about 1048.58 gets you close enough for most everyday purposes.

One kilobyte is a short email. A kilobyte is 1,000 bytes under the SI definition used by storage manufacturers and networking. Windows still labels 1,024 bytes as KB, which is the root of the 'missing space' on a new drive.

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.

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.