How many mebibytes are in one gibibyte?

Exactly 1,024 MiB. Both units are IEC binary units: 1 GiB = 2³⁰ bytes and 1 MiB = 2²⁰ bytes, so 1 GiB ÷ 1 MiB = 2¹⁰ = 1,024. The result is always an integer when the GiB input is an integer.

What is the difference between GiB and GB?

1 GiB (gibibyte, IEC binary) = 1,073,741,824 bytes (2³⁰). 1 GB (gigabyte, SI decimal) = 1,000,000,000 bytes (10⁹). The difference is about 7.4%. Drive manufacturers use GB; operating systems historically use GiB-sized values but label them "GB," which is why drives appear smaller than advertised.

What is the difference between MiB and MB?

1 MiB (mebibyte, IEC binary) = 1,048,576 bytes (2²⁰). 1 MB (megabyte, SI decimal) = 1,000,000 bytes. The difference is about 4.86%. The IEC introduced MiB in 1998 to give the binary unit an unambiguous name separate from the decimal megabyte.

Is the GiB-to-MiB conversion exact?

Yes. The factor is exactly 1,024 with no rounding. For integer GiB inputs the MiB result is always an integer. For fractional GiB inputs the result uses JavaScript 64-bit floating-point, which gives 15–16 significant digits of precision.

When would I need to convert GiB to MiB?

Common cases: Linux /etc/fstab and systemd unit files accept MiB or GiB; container orchestration (Kubernetes, Docker) resource limits may use Mi (mebibytes) notation; BIOS memory maps often report in MiB; some partition editors default to MiB while others use GiB.

Gibibytes to Mebibytes Converter

Name: Gibibytes to Mebibytes Converter
Availability: InStock
Author: Nham Vu

Enter a gibibyte value and instantly see the exact mebibyte equivalent — 1 GiB = 1,024 MiB, both IEC binary units.

Enter Gibibytes

Gibibytes (GiB)

Binary vs decimal units

1 GiB (gibibyte, binary) = 1,024 MiB

1 GB (gigabyte, decimal) = 1,000 MB

GiB and MiB are IEC 80000-13 binary units based on powers of 2. GB and MB are SI decimal units based on powers of 10.

Result

Enter a gibibyte value and click Convert.

GiB to MiB Reference Table

GiB	MiB (× 1,024)	Bytes	Common use

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Summary

Enter a gibibyte value and instantly see the exact mebibyte equivalent — 1 GiB = 1,024 MiB, both IEC binary units.

How it works

Enter any gibibyte value (integer or decimal) in the input field.
The converter multiplies by 1,024 — the exact binary ratio of GiB to MiB per IEC 80000-13.
A secondary result shows the equivalent in gigabytes (GB, decimal) for cross-standard comparison.
The calculation panel shows the formula applied so you can verify it manually.
A reference table lists common GiB sizes alongside their exact MiB and byte counts.

Use cases

Convert RAM module capacities from GiB to MiB for OS configuration files.
Size memory-mapped buffers or swap partitions in MiB when your config expects MiB.
Translate disk partition sizes from GiB to MiB in partition table tools.
Verify cloud storage quotas reported in GiB against per-file MiB limits.
Document embedded system flash memory in both GiB and MiB for hardware specs.
Cross-check kernel memory allocations when reported in different binary units.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu