1 Gibibyte equals 1,024 Mebibytes.
| Gibibyte (GiB) | Mebibyte (MiB) |
|---|---|
| 1 GiB | 1,024 MiB |
| 2 GiB | 2,048 MiB |
| 4 GiB | 4,096 MiB |
| 8 GiB | 8,192 MiB |
| 16 GiB | 16,384 MiB |
| 32 GiB | 32,768 MiB |
| 64 GiB | 65,536 MiB |
| 128 GiB | 131,072 MiB |
| 256 GiB | 262,144 MiB |
| 512 GiB | 524,288 MiB |
| 1,024 GiB | 1,048,580 MiB |
| 2,048 GiB | 2,097,150 MiB |
To convert Gibibytes to Mebibytes, multiply the value by 1,024. This factor comes from the ratio of the two units' definitions: one Gibibyte equals 1,024 Mebibytes.
For example: 1 Gibibyte = 1,024 Mebibytes, and 10 Gibibytes = 10,240 Mebibytes.
To convert in the reverse direction — from Mebibytes to Gibibytes — multiply by 0.000976563.
A gibibyte (GiB) equals exactly 1,073,741,824 bytes (2³⁰ bytes), compared to the SI gigabyte (GB) of exactly 1,000,000,000 bytes. The difference is about 7.4% — enough to matter when comparing storage advertised in GB against what an operating system reports in GiB. When you buy a "500 GB" SSD formatted in GB (500,000,000,000 bytes) and connect it to Windows, the OS reports it as about 465 GiB, leading many users to think they've been shortchanged.
The gibibyte is the practical unit for RAM in computing: a computer advertised with "16 GB RAM" actually contains 16 GiB (16 × 2³⁰ = 17,179,869,184 bytes), because memory chips are made in binary sizes. Both notations mean the same physical amount — the "GB" in memory contexts has always meant "binary gigabyte" (GiB). Only with external storage (drives) does the distinction bite users, because drive manufacturers use decimal GB while OSs report in binary GiB.
Linux and macOS have moved toward using GiB notation more accurately than Windows, reducing consumer confusion. Technical standards documents, kernel documentation, and network engineering references increasingly use GiB when binary precision matters. For data scientists and engineers working with large datasets, the distinction between GiB and GB can matter when calculating how many records fit in memory or how much data can be written to a drive in a given time.
A mebibyte (MiB) equals exactly 1,048,576 bytes (2²⁰ bytes), compared to the SI megabyte (MB) of exactly 1,000,000 bytes. The "mebi" prefix comes from the IEC 1998 standard, blending "mega" and "binary." The mebibyte is 1,024 kibibytes, and 1,024 mebibytes make one gibibyte. The difference between 1 MiB and 1 MB is about 4.9% — small for individual files but accumulating into significant discrepancies at larger scales.
Software developers and system administrators working with RAM, CPU caches, and binary-structured file systems prefer mebibytes because these systems allocate memory in powers of 2. A process allocated "512 MiB of RAM" has exactly 536,870,912 bytes, making memory arithmetic exact. Kernel developers, embedded systems programmers, and network engineers who think in binary naturally tend to use MiB when precision matters.
The mebibyte is the correct notation for the "MB" shown by operating systems like Windows when reporting RAM: Windows 10 reports a system with 8 "GB" of RAM as using "8192 MB" in Task Manager — but these are mebibytes (MiB), not megabytes (MB), even though the display says "MB." A truly metric 8 GB of RAM would be 8,000 MB = 7,629 MiB. This is why a newly formatted "8 GB" USB drive shows up as about 7.4 GiB of usable space in Windows.
1 Gibibyte equals 1,024 Mebibytes.
To convert Gibibytes to Mebibytes, multiply by 1,024. For example, 0.1 Gibibytes = 102.4 Mebibytes.
1 Mebibyte equals 0.000976563 Gibibytes.